What Is Real Estate?: 158 Key Terms

By Devon Coombs, CPA, MBA · Teaching Professor of Finance, Santa Clara University · Reviewed August 2026

Real estate is generally defined as land together with the improvements attached to it and the bundle of rights that ownership conveys. Its value derives from the income a property can produce and the price investors are willing to pay for that income, which is why concepts such as the cap rate, appraisal, appreciation, and capital expenditures appear early in most treatments of the field. These terms come from Week 1 of the free Real Estate Finance course, which covers what real estate is and how it derives its value. A working command of this vocabulary typically makes every later topic, from leases to waterfalls, easier to follow.

These terms are taught in Week 1: What Is Real Estate, and How Does It Derive Its Value? of the free Real Estate Finance course; the full course glossary collects every chapter in one place.

1031 exchange: A tax-deferred exchange under IRS Section 1031 that lets an investor defer capital gains tax by reinvesting sale proceeds into a like-kind property.
acquisition fee: A fee paid to the sponsor/GP for sourcing and closing a deal, typically 1–2% of the purchase price.
amortization: The gradual repayment of loan principal over time through scheduled payments, in addition to interest.
ancillary revenue: Income beyond base rent, such as parking, pet rent, storage, fees, and utility reimbursements.
appraisal: An independent professional estimate of a property’s value, typically using the sales comparison, cost, and/or income approaches.
appreciation: An increase in a property’s value over time, driven by rent growth, lower vacancy, expense control, market demand, renovation, or a lower exit cap rate.
asset management fee: A recurring fee paid to the sponsor/GP for managing the investment, often 1–2% of equity annually.
bad debt: Another name for credit loss: uncollectable rent from tenants who occupy but do not pay.
bundle of rights: The legal idea that ownership is a collection of rights (possession, use/control, exclusion, enjoyment, and disposition) that can be separated, transferred, leased, or encumbered.
cap rate: Capitalization rate: NOI ÷ Property Value. A valuation metric comparing a property’s net operating income to its price to gauge the approximate expected yield. Lower cap rate = higher price per dollar of NOI.; Cap rate vs Cash-on-cash return Cap rate vs Discount rate
capex: Capital expenditures: larger investments to maintain or improve a property, separate from routine operating expenses.
capital expenditures: Larger property investments needed to maintain or improve the asset: roof replacement, HVAC systems, renovations, or tenant improvements. Distinct from routine operating expenses.
capital market: The market where investors allocate capital across competing opportunities; it sets required returns through interest rates, risk premia, and investor demand.
capital stack: The layered financing structure of a deal (senior debt, mezzanine debt, preferred equity, and common equity), ordered by priority of repayment and risk.
capitalization rate: NOI ÷ Property Value. Compares a property’s net operating income to its price to gauge the approximate expected yield. Lower cap rate = higher price.
carried interest: A general partner’s performance-based share of partnership profits, typically earned after LPs receive their preferred return.
cash flow to equity: The cash remaining for equity investors after operating expenses and debt service are paid.
cash-on-cash return: Annual pre-tax cash flow to equity ÷ equity invested. Measures the cash yield on the investor’s actual out-of-pocket capital after debt service.; Cap rate vs Cash-on-cash return
Class A: The highest-quality assets in a market: typically newer, well located, professionally managed, with strong amenities. Lower going-in yields but more exposure to new supply.
Class B: Good-quality assets that may be older, less luxurious, or in secondary submarkets. Often the focus of value-add strategies, balancing stable cash flow with upside.
Class C: Older, lower-quality, or weaker-submarket assets with more deferred maintenance and higher risk. Trade at higher cap rates; can be attractive at the right basis and operated well.
CMBS: Commercial Mortgage-Backed Securities: bonds backed by pools of commercial real estate loans.
collection loss: Another name for credit loss: rent owed by occupying tenants who do not pay.
commercial mortgage-backed securities: Bonds backed by pools of commercial real estate loans, with payments and risk tranched among investor classes.
commercial real estate: Real property held primarily for business use or income production: office, retail, multifamily, industrial, hotels, data centers, and specialized assets.
comparable sales: Recently sold properties similar to the subject, used (with adjustments) to estimate value under the sales comparison approach. Often called "comps."
concessions: Incentives offered to attract or retain tenants: free rent, move-in credits, reduced deposits, waived fees, or tenant improvement allowances. One month free on a 12-month lease cuts effective annual rent by 8.3%.
cost approach: A valuation method asking what it would cost to build the property from scratch today. Useful for development analysis and as a reasonableness check on newer or special-purpose properties.
CRE: Commercial Real Estate: property held primarily for business use or income production.
credit loss: Rent owed by tenants who occupy space but do not pay, through delinquency, eviction, or abatements. Also called collection loss or bad debt. Typically 1–2% of GPR for stabilized multifamily.; Gross Potential Rent vs Effective Gross Income
DCF: Discounted Cash Flow: projects future cash flows and discounts them to present value at a required rate of return.
DCF models: Valuation models that estimate property value by forecasting future cash flows and discounting them back to today’s dollars.
debt service: The required loan payments (principal and interest) a borrower must make to the lender, paid before any cash flows to equity.; Cap rate vs Cash-on-cash return DSCR vs LTV
Debt Service Coverage Ratio: NOI ÷ annual debt service. Measures a property’s ability to cover loan payments.; DSCR vs LTV
Debt Yield: NOI ÷ loan amount. A lender metric that strips out interest rate and amortization to measure raw collateral yield.; DSCR vs Debt yield
deed: The legal document that transfers ownership of real property from one party to another, typically recorded in public land records.
deed of trust: A secured real estate financing instrument used in some states instead of a mortgage; gives a lender (through a trustee) enforceable rights on default.
deferred maintenance: Needed repairs and upkeep that have been postponed, creating future cost and risk for an owner.
depreciation: A non-cash tax deduction that lets owners recover the cost of a building over time, reducing taxable income.
direct capitalization: A single-period valuation: Value = NOI ÷ Cap Rate. Simple and widely used, but assumes stable, level income.; Direct capitalization vs Discounted cash flow (DCF)
discount rate: The risk-adjusted rate used to bring future cash flows to present value in a DCF. Reflects the time value of money plus a premium for the risk and timing of those cash flows.; NPV vs IRR Cap rate vs Discount rate
discounted cash flow: A multi-period valuation that projects cash flows over a hold period (typically 5–10 years), includes a terminal sale (reversion), and discounts everything to present value at the investor’s required rate of return.; Direct capitalization vs Discounted cash flow (DCF)
disposition: The right to sell, lease, gift, transfer, finance, or bequeath a property.
DSCR: Debt Service Coverage Ratio: NOI ÷ annual debt service. Measures a property’s ability to cover its loan payments; lenders typically require comfortably above 1.0x.; DSCR vs Debt yield
due diligence: The investigation a buyer performs before closing (reviewing leases, finances, title, physical condition, environmental status, and legal matters) to reduce the information gap with the seller.
easement: A nonpossessory right to use another person’s land for a specific purpose, such as utility, access, a shared driveway, drainage, or right of way. Can benefit or burden a property’s value.
Effective Gross Income: A property’s actual collected revenue: Net Rental Revenue (GPR minus vacancy, loss to lease, credit loss, and concessions) plus other income. The revenue line that operating expenses are paid from to reach NOI.; Gross Potential Rent vs Effective Gross Income
Effective Gross Revenue: A loosely-used synonym for Effective Gross Income: collected revenue after the four rental adjustments plus other income.
effective net rent: The true economic rent of a property after accounting for lease terms, concessions, expenses, and tenant economics.
Effective Net Revenue: Gross Potential Rent minus the four revenue adjustments (vacancy, loss to lease, credit loss, concessions), before other income is added.
effective rent: The true economic rent after concessions: total rent actually collected over the lease term divided by the number of months.
EGI: Effective Gross Income: Net Rental Revenue plus other income; the revenue line operating expenses are paid from.
EGR: Effective Gross Revenue: a loosely-used synonym for Effective Gross Income.
eminent domain: The government’s power to take private property for public use, with just compensation.
encumbrance: A claim or liability against an asset by a third party who is not the owner, restricting use, transferability, or value: mortgages, liens, easements, leases, restrictive covenants.
ENR: Effective Net Revenue: GPR minus the four revenue adjustments, before other income.
equity multiple: Total cash returned to equity ÷ total equity invested. A 2.0x multiple means the investor received twice their money back over the hold.; IRR vs Equity multiple
escheat: The reversion of property to the state when an owner dies with no legal heirs or will.
escrow: A neutral third party that holds funds and documents and facilitates the closing of a real estate transaction.
face rent: The stated rent on the lease before accounting for concessions like free rent or move-in credits.
Fannie Mae: A government-sponsored enterprise that supports the U.S. mortgage market, including multifamily lending and published underwriting standards.
fee simple: The most complete private ownership interest in real property: the broadest possession, use, exclusion, enjoyment, and disposition rights, still subject to taxes, eminent domain, and any private encumbrances.
financing structure: The mix of debt and equity used to acquire or hold a property, including loan amount, interest rate, amortization, and investor capital.
fixture: An item that began as personal property but became part of the real property when permanently attached, such as a built-in HVAC system once installed.
foreclosure: The legal process by which a lender takes and sells a property to recover an unpaid debt after a borrower defaults.
Freddie Mac: A government-sponsored enterprise that supports the U.S. mortgage market, including multifamily lending.
free rent: A concession giving the tenant one or more months at no rent, usually at the front of a lease. Reduces effective rent even though face rent is unchanged.
general partner: The GP in a real estate fund, which sources deals, manages assets, makes key decisions, and earns fees plus carried interest.
general vacancy: Income lost when units are physically unoccupied or unavailable for rent during the year: turnover gaps, lease-up time, and units offline for repairs. A common stabilized baseline is ~5% of GPR.
going-in yield: The initial return a buyer expects at acquisition, typically the year-one cap rate (year-one NOI ÷ purchase price).
government-sponsored enterprise: A federally chartered entity (e.g., Fannie Mae, Freddie Mac) that supports lending in targeted markets such as housing.
GPR: Gross Potential Rent: theoretical maximum revenue with full occupancy and full collection.
gross lease: A lease where the tenant pays a fixed rent while the landlord bears most property operating expenses.
Gross Potential Rent: The theoretical maximum revenue a property would produce if every unit were leased at market rent for the full year with zero vacancy and zero collection loss. Also called Gross Scheduled Income, Gross Potential Revenue, Potential Gross Income, or Gross Revenue. The starting point of every income model.; Gross Potential Rent vs Effective Gross Income
Gross Revenue: Another name for Gross Potential Rent: the theoretical maximum rental revenue before any vacancy or collection adjustments.
Gross Scheduled Income: Another name for Gross Potential Rent: the theoretical maximum revenue with full occupancy and full collection.
HBU: Highest and Best Use: the use producing the highest supported value, subject to legal, physical, and financial tests.
heterogeneous: Not uniform: rarely are two real estate assets exactly alike. Even similar-looking buildings differ in location, age, quality, tenants, leases, zoning, and condition.
highest and best use: The reasonably probable use of a property that is legally permissible, physically possible, financially feasible, and maximally productive. Often produces a different value than the current use.
income approach: A valuation method that values a property based on the cash flow it generates, via direct capitalization or discounted cash flow. The standard method for commercial real estate.
income-producing real estate: Property purchased or owned primarily to generate rental income and investment returns.
investable universe: The total pool of assets available to invest in within a given market or segment.
investor returns: The financial results earned by an investor, commonly measured through cash-on-cash return, IRR, equity multiple, and total profit.
IRR: Internal Rate of Return: the annualized discount rate that sets the net present value of all cash flows (including the sale) to zero. A time-weighted measure of return.; NPV vs IRR IRR vs Equity multiple
lease rollover: The expiration and re-leasing of space during the hold period, a key risk if leases renew at lower rents, need concessions, or go vacant.
leased fee: The owner’s interest in a property that is subject to a lease: the right to receive rent plus the reversion when the lease ends.
leasehold: A tenant’s property interest created by a lease: possession and use rights for a defined period, without owning the underlying real estate. Can have independent economic value.
leverage: The use of borrowed money (debt) to finance part of a purchase. It magnifies returns when the property’s return exceeds the cost of debt, and magnifies losses when it does not.
lien: A legal claim against property securing a debt or obligation, such as property tax, mechanic’s, judgment, or mortgage liens. Affects title, sale proceeds, lender priority, and foreclosure risk.
limited partner: The LP in a real estate fund, which provides most of the capital, with limited liability and economic participation but little day-to-day control.
limited partnership: A common real estate ownership structure with a managing general partner and passive limited partners who supply most of the capital.
liquidity: How quickly and cheaply an asset can be converted to cash at a fair price. Real estate is relatively illiquid compared with public stocks.
liquidity risk: The risk that a property cannot be sold quickly, financed efficiently, or sold at a fair price, and is higher for specialized assets, weak markets, and stressed conditions.
Loan-to-Value: Loan amount as a percentage of property value. A core lender sizing metric; CRE is commonly 55–70%.; DSCR vs LTV DSCR vs Debt yield
loss to lease: The gap between current market rent and the actual contract rent being paid by in-place tenants. If a unit could rent for $2,000 today but the tenant pays $1,850, the loss to lease is $150/month for that unit.; Gross Potential Rent vs Effective Gross Income
LTV: Loan-to-Value: the loan amount as a percentage of property value. Commercial real estate is commonly financed at 55–70% LTV.
market rents: The rents that similar properties in the same location can currently command from tenants.
market risk: The risk that broader conditions (supply, demand, employment, rates, inflation, sentiment) weaken property performance or value.
mezzanine debt: Subordinated financing that sits between senior debt and equity: higher cost than senior debt, lower than equity, repaid after senior debt but before equity.
modified gross lease: A lease where the landlord and tenant split operating expenses in a negotiated way.
mortgage: A financing instrument giving a lender a security interest in real property. The borrower keeps ownership, possession, and use; the lender gains enforceable rights if the borrower defaults.
mortgage-backed securities: Securities representing claims on the cash flows from pools of mortgage loans, allocating payments and risk among classes of investors.
multifamily: Residential rental property with multiple units, such as an apartment building. Demand depends on housing need, rents, occupancy, and turnover.
net operating income: Rental and other income remaining after operating expenses (property taxes, insurance, maintenance, utilities, management) but before debt service, income taxes, and capital items. The central measure of property-level profitability.; Cap rate vs Cash-on-cash return DSCR vs LTV DSCR vs Debt yield
Net Rental Revenue: Rental revenue remaining after subtracting vacancy, loss to lease, credit loss, and concessions from Gross Potential Rent.
NNN: Triple-net lease: tenant pays base rent plus property taxes, insurance, and maintenance.
NOI: Net Operating Income: income after operating expenses but before debt service, taxes, and capital items. The central measure of property-level profitability.
operating cash flow: Cash generated from a property after collecting income and paying normal operating expenses, before financing costs and taxes.
operating expenses: The recurring costs of running a property (property taxes, insurance, maintenance, utilities, and management), deducted from revenue to reach NOI.
opportunity cost: The return given up by choosing one investment over the next-best alternative use of the same capital.
opportunity zone: A federally designated area where investments can receive capital-gains tax incentives to encourage development.
origination fee: A fee charged by a lender to set up a loan, typically 0.5–1% of the loan amount.
other income: Ancillary revenue beyond base rent: parking, laundry, pet fees, application/admin fees, storage, utility reimbursements (RUBS), and vending/telecom revenue-share.
payback period: The time required for an investment’s cumulative cash flows to recover the initial capital invested.
percentage rent: Additional rent (common in retail) calculated as a percentage of the tenant’s sales above a threshold.
personal property: Movable property not permanently attached to land: furniture, vehicles, equipment, inventory, computers, and tools.
Phase I: Phase I Environmental Site Assessment: pre-acquisition environmental due diligence to flag potential contamination.
Phase I Environmental Site Assessment: A standard pre-acquisition environmental due-diligence report identifying potential contamination or environmental liability before closing.
police power: The government’s authority to regulate property use to protect public health, safety, and welfare, the basis for zoning and building codes.
possession: The right to occupy, hold, or physically control a property.
Potential Gross Income: Another name for Gross Potential Rent: the theoretical maximum revenue with full occupancy and full collection.
preferred equity: An equity position with priority over common equity for distributions and repayment, usually earning a fixed preferred return.
preferred return: A minimum return (often 6–10%) paid to limited partners before the general partner earns its promote. Often called the "pref."
pro forma: A projected financial statement for a property that forecasts income, expenses, and cash flow under a set of assumptions.
promote: The general partner’s share of profits above the LP preferred return, also called carried interest.
property management: Day-to-day operation of a property (tenant relations, rent collection, maintenance, and vendor management), usually for a fee of 3–8% of effective gross income.
property taxes: Taxes levied by local government on real property value, usually the single largest operating expense for a commercial property.
PropTech: Property technology, meaning software and tools serving real estate participants: lease management, market research, appraisal support, legal documents, collections, and more.
real property: Land and anything permanently attached to it: buildings, fences, underground utilities, paved improvements, and planted trees.
refinance: Replacing existing debt with a new loan: to lower the rate, extend the term, or pull out equity. Refinance risk arises when new terms are worse or financing is unavailable at maturity.
REIT: Real Estate Investment Trust: a company that owns, operates, or finances income-producing real estate; generally must distribute at least 90% of taxable income as dividends. Offers liquidity and diversification.
rent control: Local laws that cap rent levels or increases, which can hold in-place rents well below market and create large loss-to-lease positions.
rent roll: A schedule of the units or tenants at a property showing current contract rent, lease start and end dates, and occupancy, forming the basis for revenue underwriting.
replacement cost: The cost to rebuild a property from scratch today. Market value can exceed replacement cost in supply-constrained markets.
residual land value: The value left for the land after subtracting development costs and required investor return from the value of a completed project.
restrictive covenant: A private restriction (recorded in the deed or subdivision documents) limiting what an owner may do with a property.
reversion: The estimated sale value (or release) of a property at the end of the hold period in a DCF analysis.; Direct capitalization vs Discounted cash flow (DCF)
risk: The possibility that actual results differ from expectations: lower rents, higher vacancy, market shifts, rising costs, tenant default, or lower resale value.
RUBS: Ratio Utility Billing System: a method of passing through utility costs (water, trash) to tenants on a pro-rata basis.
sales comparison approach: A valuation method that finds similar recently sold properties and adjusts for differences. Works best for residential real estate with many transactions and relatively homogeneous assets.
servicing fee: A fee earned by a loan servicer for collecting payments and administering a loan over its life.
single-purpose entity: A legal entity (often an LLC) formed to own one property, used to isolate liability from the owner’s other assets.
sponsor: The party that originates, structures, and operates a real estate investment, typically the general partner who earns fees and a promote.
submarket: A smaller geographic or product segment within a larger market that can behave very differently, such as downtown office versus suburban retail within the same city.
tenant credit risk: The risk that a tenant cannot meet its lease obligations, affecting rent collection, downtime, legal costs, and re-leasing.
tenant improvement: Build-out or upgrades to a leased space, often funded by a landlord allowance (TI) to attract or retain a tenant.
terminal sale: The assumed sale of the property at the end of the hold period; its value (the reversion) is discounted back in a DCF.
title: The legal evidence of ownership of a property and the rights that come with it.
title insurance: Insurance that protects a buyer or lender against losses from defects in a property’s title, such as undisclosed liens or ownership disputes.
triple-net lease: A lease where the tenant pays base rent plus some or all property taxes, insurance, and maintenance, shifting most operating cost risk to the tenant.
UCC filing: A public filing under the Uniform Commercial Code that perfects (legally records) a lender’s security interest in personal property.
Uniform Commercial Code: A standardized set of U.S. laws governing commercial transactions; personal-property financing is typically secured under it and perfected by a UCC filing.
unlevered return: The return on a property assuming no debt: NOI ÷ purchase price. Isolates asset performance from financing.
user/space market: The market for occupancy, where tenants demand space and owners supply it; the price in this market is rent.
vacancy: The portion of rentable space that is not occupied or not generating rent.
value-add: An investment strategy that improves a property through renovation, better management, expense control, or rent increases to raise NOI and value.
workforce housing: Generally moderately priced rental housing aimed at middle-income workers, often a Class B multifamily strategy.
zoning: Local land-use regulation that dictates how a site may be used and developed, directly shaping highest and best use and value.

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