How to Value Your NYC Condo or Co-op

Start With Recent Closed Sales, Not Asking Prices

The single biggest mistake owners make is anchoring to what a similar apartment is currently listed for. Listing prices are aspirational. What matters is what comparable units have actually closed for in the last 3–6 months — ideally in your own building, and failing that, in buildings of similar age, quality, and location nearby. A unit that's been sitting on the market for 90 days at a certain price tells you almost nothing about value; it may tell you the seller is overpriced.

Price Per Square Foot Is the Starting Benchmark

The most common way to compare apartments of different sizes is price per square foot ($/SF) — sale price divided by the unit's square footage. As of mid-2026, NYC's median price per square foot citywide runs around $812, with Brooklyn somewhat higher at roughly $1,019 and Queens medians closer to the $700s on a total-price basis. These are citywide and borough-wide averages that move constantly and vary enormously by neighborhood and building class — useful as a sanity check, not as a substitute for real comps in your specific building or block.

Then Adjust for What Comps Don't Capture

Once you have a $/SF range from real comps, you adjust up or down for factors that a simple square-footage comparison misses:

• Floor and light — higher floors and better exposure typically command a premium, especially with views
• Layout efficiency — a well-laid-out 2-bedroom with defined rooms usually beats an awkward "flex" 2-bedroom carved from a 1-bedroom
• Renovation condition — move-in-ready, recently renovated units sell faster and at a premium over "as-is" or dated units (see our value drivers guide)
• Outdoor space — a private balcony or terrace adds real value, though rarely dollar-for-dollar against interior square footage
• Building quality and amenities — doorman service, elevator, gym, and building financial health all factor in
• Monthly carrying costs — high maintenance or common charges relative to comparable buildings can suppress what a buyer is willing to pay upfront (see our condo vs. co-op guide)

Co-ops Need One Extra Step

For a co-op, appraisers and buyers layer on additional considerations beyond the comps-and-adjustments process: the building's underlying mortgage (a large one can suppress value), the maintenance figure and what it includes, and how restrictive the co-op board's financial requirements and sublet policy are. Two structurally identical apartments in different co-op buildings can have meaningfully different values purely because of building-level financial health and board conservatism — something a pure condo comp analysis doesn't need to account for.

Market Conditions Move the Whole Curve

Every comps analysis is a snapshot of a market that's moving. In 2026, that's meant real divergence: condo prices have been climbing faster than co-op prices citywide, inventory has been tight in Manhattan even as it's grown elsewhere, and mortgage rate movements have shifted buyer purchasing power meaningfully within the same year. See our current market trends guide for the specifics — a comps analysis done six months ago may already be stale.

What a Professional Analysis Adds

A broker or appraiser doing this properly pulls actual closed transactions from the public record and MLS-equivalent listing services (not just what's publicly visible on consumer sites), weighs comps by true similarity rather than simple averaging, and factors in current absorption trends in your specific micro-market. That's the gap between a rough self-estimate and a number you can actually price a listing around.