Price per Square Foot

How price per square foot works

Price per Square Foot = Purchase Price ÷ Building Area (square feet)

If a 10,000-square-foot building sells for $2,000,000, the price per square foot is $2,000,000 ÷ 10,000 = $200. Listings and offering memoranda quote it because it needs only two facts, the price and the area, and because it lets a buyer compare a 4,000-square-foot retail building with a 40,000-square-foot warehouse on one scale.

Turn the formula around and it becomes a rough pricing tool: estimated value = comparable price per square foot × building area. If similar buildings nearby have sold for $180 to $220 per square foot, a 10,000-square-foot building lands between $1,800,000 and $2,200,000. That range is a starting point for a conversation, not an appraisal.

Appraisers use the same idea. In the sales comparison approach, they gather recent sales of similar properties and reduce each to a unit of comparison. Price per square foot is the unit most often used for office, retail and industrial buildings, while multifamily is usually compared per apartment. It is a metric used within the valuation methods, not a separate valuation method of its own.

Which square feet? Gross, rentable and usable area

The denominator is where most mistakes happen. “Square feet” can mean three different things:

• Gross building area is the whole building, including common areas, stairwells, elevators and mechanical space.
• Rentable area is what tenants pay rent on: the space they occupy plus an allocated share of common areas.
• Usable area is the space a tenant actually occupies and furnishes.

Rentable area is larger than usable area, and the ratio between them is often called the load factor. For office buildings, the measurement method most leases reference is the BOMA standard (ANSI/BOMA Z65.1), whose main use is calculating rentable area for leasing. It is voluntary, and an owner may measure by an older edition or by another method, so a lease or listing that says nothing about how it was measured leaves room for argument.

The choice changes the answer. Take the same $2,000,000 building with 12,000 gross square feet and 10,200 rentable square feet:

Measured on	Area	Price per square foot
Gross building area	12,000 SF	$166.67
Rentable area	10,200 SF	$196.08

The rentable-area figure is about 18% higher than the gross-area figure for the same building at the same price. If one broker quotes the first number and another compares it with sales quoted on the second, the building looks like a bargain that it is not. Before comparing, ask what the area figure is, who measured it and when, and whether the lender’s appraiser will use the same figure.

Worked example: same price per foot, different buildings

Two 10,000-square-foot buildings are priced at $2,000,000, or $200 per square foot. Building A is leased to tenants paying rents that produce $140,000 of net operating income. Building B has more vacancy and produces $100,000.

	Building A	Building B
Price	$2,000,000	$2,000,000
Area	10,000 SF	10,000 SF
Price per square foot	$200	$200
NOI	$140,000	$100,000
NOI per square foot	$14.00	$10.00
Cap rate (NOI ÷ price)	7.00%	5.00%

The price per square foot is identical, and the yield is two points apart. If the market prices buildings like these at a 7.00% cap rate, Building B’s income supports about $1,428,571, or roughly $143 per square foot, not $200. Price per square foot cannot see that, because it does not know the rents, the vacancy, the expense load or the condition. It treats a fully leased building and a half-empty one as the same product.

These figures are illustrations computed by simple arithmetic, not market data. The rents and expenses behind the NOI are assumptions chosen to keep the numbers easy to follow. The rent per square foot calculator works the income side of the same comparison.

Price per square foot vs. other metrics

• Price per square foot vs. price per unit. Per-unit pricing is the multifamily measure and ignores apartment size. Per-square-foot pricing handles size but ignores how the space is divided. Where unit mixes differ, compare both.
• Price per square foot vs. cap rate. Cap rate uses income, so it measures return. Price per square foot uses area, so it measures how the price compares with other buildings. Use per-foot pricing to choose which listings to study and cap rate to decide what the building is worth.
• Price per square foot vs. gross rent multiplier. GRM divides price by gross rent, so it brings income into the comparison, though it still ignores expenses.
• Sale price per foot vs. rent per foot. They are different numbers. Rent per square foot is a yearly (or monthly) income figure; price per square foot is a one-time cost. Dividing annual NOI per foot by price per foot gives you the cap rate.
• Price per square foot vs. replacement cost per foot. If a building trades well below what it would cost to build per square foot, that is useful context. If it trades far above, expect the market to be rewarding the location or the income, not the structure.

Why lenders care

A lender does not size a loan from price per square foot. Proceeds come from the tests built on income: debt service coverage, loan-to-value and, on some loans, debt yield. For a typical bank loan, the loan-to-value figure is 65–75% (80% multifamily).

Per-foot numbers still matter in two places.

• The appraisal. Value drives loan-to-value, and an appraisal weighs recent sales of similar buildings alongside the income approach. If your contract price per foot sits well above those comparables, the appraised value can come in below the price, and the loan is sized on the lower number. You then fund the difference with more cash at closing.
• Loan per square foot as a sanity check. On the site’s standard example, a $1,400,000 loan against a $2,000,000 purchase is 70% loan-to-value. On a 10,000-square-foot building, that is $140 per square foot of debt against a $200 per square foot price. A loan per foot that is high next to comparable buildings is the kind of figure a credit committee may ask about. The same loan gives a debt yield of 10% on Building A ($140,000 ÷ $1,400,000) and about 7.1% on Building B, which is why the same price per foot can support very different loans.

Owner-occupants should note one more thing. If you will use the building for your own business, the price per foot may matter less than what you would otherwise pay in rent for the same space. Our guide to owner-occupied commercial real estate loans covers how that comparison works, and the owner-occupied loan page covers the products, including SBA 504.

What to watch for

• Confirm the area basis. Ask whether the number is gross, rentable or usable, how it was measured, and whether there is a survey or measurement report. A shortfall found after closing is a price you have already paid.
• Compare like with like. Per-foot comparables only work against buildings of similar type, age, class, location, size and lease structure. Size can change the per-foot figure, so a comparison across very different building sizes can mislead.
• Check the lease type. A building with triple-net leases and one with gross leases can have the same rent per foot and very different NOI, because the landlord pays the expenses under a gross lease. See also CAM charges.
• Separate land from building. Price per foot of building area hides land. A small building on a large lot, or a site with development potential, is priced on the dirt as well as the structure.
• Add the work to the price. For a value-add purchase, the all-in cost per foot is the purchase price plus renovation, tenant improvements and leasing costs, divided by area. Compare that with the price per foot of fully renovated, fully leased comparables to see whether the plan leaves any margin.
• Do not negotiate on price per foot alone. If a seller defends the price by pointing at higher per-foot sales elsewhere, respond with the building’s own NOI and the cap rate that price implies.
• Use actual rents, not pro forma rents. A lender underwrites in-place income from the rent roll and the trailing 12 months, so price per foot built on projected rents will not match the loan you can get.

Using price per square foot before you apply

A sensible order for a purchase is to screen on price per foot, request the rent roll and trailing 12-month statement, calculate NOI and cap rate, and then test the financing. Property type changes what the numbers mean, so see our pages on office building loans, retail property loans and industrial property loans. The cap rate guide goes deeper on the valuation step. When you have the documents, send us the rent roll and T-12 and we can review how a lender would size the loan.

Sources: BOMA International, “Office (ANSI/BOMA Z65.1)” (boma.org), on the office measurement standard and its use in calculating rentable area. The unit-of-comparison and load-factor descriptions are general explanations, not quotations from a standard. All building examples are illustrative arithmetic, not market data.