The Manhattan office-to-residential conversion pipeline moved from theory to closings in 2025, and Skyline Properties brokered two of the defining transactions: the $135M sale of 6 East 43rd Street to the Vanbarton Group and the $105M acquisition of 101 Greenwich Street by Quantum Pacific and Metro Loft. Together they show what actually gets converted, who buys, and how the deals are structured.
What the closed deals teach
- 6 East 43rd Street — $135M, Vanbarton Group: a 27-story, 400,000 SF Midtown office tower converting to 441 rental apartments, 111 of them permanently affordable, financed by a $300M Brookfield construction loan under the 467-m program.
- 101 Greenwich Street — $105M, Quantum Pacific + Metro Loft: a 26-story, 400,294 SF Financial District tower pairing international capital with New York's most experienced conversion operator.
- The buyer profile is specific: sponsors with conversion track records, institutional construction financing, and affordable-housing execution capability — not generalist office investors.
The 467-m engine
The economics run through NY RPTL §467-m: up to 90% property-tax abatement in the early years, phasing out over a period of up to 35 years, in exchange for affordable-housing commitments that vary by location. That structure is what turns an obsolete office basis plus conversion cost into a financeable residential project — it is why 6 East 43rd could support a $300M construction loan.
Which buildings qualify in practice
- Floor plates and light: prewar and side-core plates convert efficiently; deep, dark plates fight the residential layout.
- Basis: the acquisition price must make sense against conversion cost — which is why sellers of obsolete stock meet the market through conversion buyers, not office buyers.
- Location: proximity to transit and residential amenity, which is why Midtown East and the Financial District lead the closed record.
- Vacancy path: a building that can be delivered vacant, or nearly so, commands the conversion premium.
For owners weighing the decision
The pipeline is competitive on both sides: developers are hunting qualified buildings, and the abatement clock rewards owners who move while the program economics hold. Skyline's sell-or-convert analysis prices both paths — continued office operation versus a conversion exit — against the firm's closed record. The 6 East 43rd and 101 Greenwich files are the reference cases.