Leasing & tenant law · Deals & development · 10/19/2026
Manhattan Office Owners Fill Space Before It Ever Hits the Market
Manhattan office owners are quietly leasing freshly vacated space before marketing it, according to JLL, because tenants are moving fast as supply tightens. AI firms seeking built, ready space in Midtown South are driving many deals. JLL says these off-market leases form a shadow market, so real availability is likely lower than the official numbers show.
Reported by Commercial ObserverRead the original ↗
What happened
Commercial Observer reported on October 19, 2026 that more Manhattan office space is being leased before it is ever publicly marketed. According to JLL, many office owners are quietly keeping blocks of space off the market so eager tenants can sign faster. Melanie O'Brien, head of research at JLL, said the practice is driven by the pace of leasing rather than landlords holding out for higher rents.
The trend comes as supply tightens. Colliers reported that Manhattan office leasing totaled 10.06 million square feet in the third quarter of 2026, 16.2 percent above the five-year quarterly average. Year-to-date demand reached 32.86 million square feet, the strongest comparable period since 2000. Colliers said September's 64.76 million square feet of available supply was the lowest since August 2020. It put the availability rate at 12.4 percent, the 10th straight quarter that availability tightened or held steady. JLL said off-market deals create a "shadow market," so real availability is likely lower than the official figure.
Most off-market deals involve recently vacated smaller blocks, usually about 5,000 to 20,000 square feet on a floor or two. Many are subleases. Brokers said AI companies are especially active and want built-out, furnished space in Midtown South, including SoHo and the Meatpacking District. A source said an AI company signed a roughly 30,000-square-foot lease at 71 Fifth Avenue before the space hit the market, at some of the highest rents the building has seen. Some existing tenants are also expanding through a right of first offer, which requires a landlord to offer space to them before marketing it publicly. A source said three tenants at a Park Avenue building did this, each taking space in the 50,000-square-foot range.
Key facts
- Outlet and date
- Commercial Observer, October 19, 2026
- Q3 2026 leasing
- 10.06 million square feet (Colliers)
- Year-to-date demand
- 32.86 million square feet, strongest comparable period since 2000 (Colliers)
- Availability rate
- 12.4 percent in Q3 2026 (Colliers)
- Available supply
- 64.76 million square feet in September, lowest since August 2020 (Colliers)
- Typical off-market block
- About 5,000 to 20,000 square feet
- Example deal
- About 30,000 square feet to an AI company at 71 Fifth Avenue, per a source
- Upcoming supply
- 625 Madison Ave (858,500 sq ft), 70 Hudson Yards (1.4 million sq ft), 343 Madison Ave (930,000 sq ft)
What it means
Landlords
This story is about large Manhattan office buildings, not residential rentals. Small residential landlords should treat it as a sign of a tight Manhattan office market, not as a guide to apartment leasing.
Buyers and owners
Published availability figures may overstate how much Manhattan office space is actually open, since off-market deals do not show up until they close. Anyone weighing office-related property in Manhattan should keep that lag in mind.
Tenants and voucher holders
The article does not address apartments, rents for residential tenants or voucher programs. It has no direct effect on apartment searches described in the material.
The highlights
- Manhattan office leasing hit 10.06 million sq ft in Q3 2026, per Colliers.
- Availability fell to 12.4%, the 10th straight quarter it tightened or held flat.
- Most off-market deals are 5,000 to 20,000 sq ft blocks across a floor or two.
Why it matters Landlords
A tight Manhattan office market shows strong commercial demand, but it has little direct effect on residential landlords or voucher holders.
Not known yet
- How much Manhattan office space is leased off-market in total; the article says this is unknown
- Rent levels for the off-market deals, beyond a source's claim of record rents at 71 Fifth Avenue
- Which SoHo buildings were involved in Cursor's off-market subleases
- Whether the trend will continue as new office towers come online
Background
In Manhattan office leasing, brokerage availability rates generally count space that is being actively marketed, including space coming available soon and sublease space. Space that is leased before it is ever listed often never appears in those counts. A sublease is a deal in which an existing tenant rents some or all of its space to another company, and office leases commonly require the landlord's consent for that. A right of first offer is a lease clause giving an existing tenant the first chance to take space that opens in its building.
Summary written by Bulwark from Commercial Observer’s reporting. The original story is at commercialobserver.com. This is general information, not legal advice.
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