14 Maiden Lane (The Diamond Exchange)

Gilbert A. Schellenger designed the building for developers Abraham Boehm and Lewis Coon, who acquired the site in 1892 to house jewelers and diamond dealers. Published histories describe the building as among the first in the city with oversized bay windows, set out so dealers could grade stones by daylight. The floors were reinforced to carry jewelry safes. Maiden Lane was then the center of the American diamond trade, which later moved north to West 47th Street.

Diamond Lane LLC bought the building in early 2022 for $9.5 million, when it held artists' lofts and commercial space. Morali Architects led the conversion, with Kiefer & Schuster Engineering on structure and A&D Engineering on mechanical, electrical and plumbing. Department of Buildings records show the work as a set of alteration jobs: interior demolition, structural work including a first-floor horizontal extension and cellar vault reinforcement, a new heating, ventilation and air-conditioning system, and sprinkler and plumbing work. The principal renovation job was signed off on May 12, 2026. The DOB filings list nine dwelling units both before and after the work.

The sponsor lists every floor at 1,334 square feet, the commercial floor included; press releases round to about 1,300. Ceilings rise to 12 feet 6 inches on some floors. Each residence has two bedrooms and a flex room with a folding wall, two full baths (one with a steam shower), an open kitchen with Viking, Bosch and Dacor appliances, a bar with a wine cellar, white oak chevron floors, multi-zone heating and cooling, and a Bosch washer and dryer. The tenth-floor penthouse adds a roof deck with an outdoor kitchen and pergola.

Building services are limited: a virtual doorman, a package room, optional storage and building-wide internet. The sponsor presents the short amenity list as a way to keep common charges low. The lobby chandelier is described in published reporting as having hung in Harrods Buenos Aires.

Per the offering plan filed with the New York State Attorney General (plan CD240318, Diamond Exchange Condominium), the plan was submitted November 14, 2024 and accepted November 6, 2025, with Diamond Lane LLC as sponsor; it had not been declared effective as of October 2026, so closings cannot begin yet. The plan covers 19 units: nine residences, one commercial unit and nine storage units. The total offering price was $27,230,000 at acceptance. Amendment 1, accepted January 29, 2026, raised it by $10,000 to $27,240,000, filed a new Schedule A, updated the real estate tax projection and moved the first year of operation to March 1, 2026. The record also lists an initial price of $27,180,000, $50,000 below the price at acceptance. The record does not report units sold.

Published asks:

• From $2,580,000, the sponsor's stated entry price (about $1,934 per square foot at 1,334 square feet)
• $2,690,000 for a listing posted in June 2026, unit not identified in listing records (about $2,016 per square foot at the same size)

Press coverage in September and October 2026 put pricing at "just under $2.6 million." No per-floor price schedule or penthouse ask has been published. Higher floors and the penthouse, with its roof deck, will likely price above the entry figure, but the plan's Schedule A sets each unit's price.

No condominium unit lots or sponsor closings appear in ACRIS as of October 2026. City records still classify the lot as a single elevator building owned by the sponsor.

Recent sales

Sales sourced from NYC Department of Finance recorded transfers (BBL 1-00064-0023; each condominium apartment is its own tax lot). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price.

Confirm the plan status. Get the plan's acceptance date, the latest amendment and any change in prices or unit count from the sponsor's attorney. If the plan has not been declared effective, closings cannot begin until it is.

Certificate of occupancy. The conversion was filed as alterations with no change of use or occupancy, and the building already counted nine dwelling units. Ask what certificate of occupancy the building holds, temporary or final, and what your lender will require at closing.

One unit per floor. Every residence has a private landing, and the floors are almost identical in size. Your choice comes down to ceiling height, light and the penthouse roof deck. Price differences should reflect those factors.

Carrying costs. With nine residences, each owner carries a large share of the building's fixed costs: elevator, roof, facade, insurance. The plan's first-year budget sets common charges. Compare the reserve fund to the age of the facade, and ask about Local Law 11 facade inspection timing for a 130-year-old masonry exterior.

Closing costs. In sponsor sales the buyer customarily pays the New York State transfer tax (0.4%, or 0.65% at $3 million or more) and the New York City real property transfer tax (1.425% above $500,000), plus the mansion tax. On a $2,580,000 purchase that is about $10,320 in state transfer tax and $36,765 in city transfer tax, about $47,085 in all, before any gross-up, and $32,250 in mansion tax at the 1.25% tier.

Deposit. Sponsor contracts typically require 10% to 20% at signing, held in escrow. Listing records show a 20% minimum down payment for the building; confirm the financing terms in the plan.

• 67 Liberty Street — on the same block, a condominium of full-floor and duplex homes behind a retained commercial facade
• 1 Park Row — new-construction Financial District condominium overlooking City Hall Park
• 1 Wall Street — Financial District office-to-condominium conversion, at a far larger scale
• 15 William Street — 2008 Financial District condominium, a resale benchmark for the area
• 130 William Street — 66-story Adjaye-designed condominium completed in 2020
• 25 Park Row — COOKFOX-designed condominium across from City Hall Park