Rentable vs Usable Square Feet: NYC Office Leasing, Explained

How the two numbers work in a New York lease

The landlord measures the building, and the landlord's figure is what goes in the lease. No statute dictates how a New York office floor must be measured, so two owners can apply different conventions to near-identical floor plates, and the same physical space can carry meaningfully different rentable totals depending on who owns it.

The loss factor is the percentage by which rentable exceeds what you can occupy: your slice of the lobby, elevator core, and mechanical areas, plus, on a multi-tenant floor, the shared corridor and restrooms, which is why partial floors carry the heavier loss factors. The 15-25% range is the norm here, but the controlling number is whatever the lease says, so confirm it on the specific lease.

A worked example at the citywide median

Take the citywide median asking rent on our book, $75 per rentable square foot per year. At a 15% loss factor, each foot you can actually occupy costs about $85 a year, which is $72 divided by 0.85. At a 25% loss factor the identical quoted rent works out to $96 per usable foot, $72 divided by 0.75. Nothing on the listing changed, yet the space your team sits in got more than a tenth more expensive.

Two floors quoted at the same rentable rate are rarely the same deal. The efficient floor at the higher asking rent frequently seats the same headcount for less total money, and total money is the only column that matters at signing.

What is negotiable, and what we push on

The measurement itself is rarely reopened; landlords treat their rentable figure as settled, and attacking it head-on goes nowhere. What moves is everything priced off it: we verify the usable footage with an architect's test fit before signing, we translate every competing floor into cost per usable foot, and we use a heavy loss factor as leverage on face rent, concessions, and free rent.

Representation matters because the measuring party and the charging party are the same party, and a broker who also acts for landlords has an obvious conflict on whether a loss factor is defensible. Nomad represents tenants exclusively, never landlords, across 300+ delivered New York offices, so the argument only ever runs one direction.

Where tenants lose money

The recurring losses come from a few gaps.

• Comparing quoted rents across buildings. Two floors at the same rentable rate can sit at opposite ends of the 15-25% band, and the tenant who signs on the quoted number alone routinely pays more per desk.
• Remeasurement. Some leases let the landlord remeasure, and rentable footage in this market tends to grow between lease generations while the walls stay put. Check whether renewal and expansion rents attach to the original figure or a fresh one.
• Charges that scale off rentable. Escalations, operating pass-throughs, and per-square-foot charges all run on the rentable number, so a padded figure inflates every line of the lease for the full term.
• Skipping the test fit. The floor plan flatters; the architect's layout does not. Divide your all-in annual cost by the seats the layout actually delivers and let cost per seat decide.