100 West 15th Street

The building reads as what it is: a five-story brick factory holding the Sixth Avenue corner, with a small commercial space at grade and four-plus floors of lofts above. Inside, the loft vocabulary is intact — ceilings to roughly 15 feet on the best lines, exposed brick, cast-iron-era columns, and arched windows on the avenue exposures. The 44 apartments run from studios through combined two-bedroom-scale lofts, and renovation quality varies widely unit to unit, from preserved-raw spaces to full architect renovations — a spread that shows in closed pricing. With only 45 units across five floors, most lines get genuine light from the corner exposure; the Sixth Avenue side trades street energy for sun.

This is a lean, self-service cooperative: no doorman, a virtual-doorman video intercom, a building employee for daily upkeep, and a board that has documented its work in shareholder newsletters on file with us. The amenity set is practical — renovated central laundry, package room and locker, storage for rent, bike storage. Monthly fees are reasonable for the location per listing records, which is the structural payoff of running without lobby staff. House rules on file require 80 percent floor coverage, written board approval for alterations with weekday work hours, and homeowner insurance at stated minimums. The offering plan, house rules, sublet policy, board communications, and audited financial statements are on file in The Roebling Research Library.

Recent sales

Recent transfers at this building, from The Roebling Research Library. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.

Market read. Most recent trades (2025) cleared a median $888/sf (floor-adjusted) across 1 sale. Floor-adjusted means each sale is restated to a constant mix of floors, so the figure can differ from the plain median of the sales listed above. Median listing discount 1.6% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.

Sales sourced from NYC Department of Finance recorded transfers (BBL 1-00790-0040). 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; square footage on co-ops is not officially recorded, figures shown are approximate.

You are buying the loft, the corner, and the carry. Authentic factory architecture, a two-minute walk to nearly every subway line in Manhattan, and self-service monthlies. If those three facts fit your life, little else downtown delivers them together at this basis.

No doorman means self-service. Packages run through a locker system, entry through a virtual doorman, daily upkeep through the building employee, and decisions through a small board of neighbors. Confirm the employee's current hours and duties with the managing agent. Buyers coming from full-service buildings should price the trade honestly — in both directions.

The sublet framework is documented and specific. Two-year seasoning, then a maximum of three years out of five, one-to-two-year leases, and a graduated fee of 10/15/20 percent of annual maintenance — per the board's written policy on file. Investors should look elsewhere; flexibility-minded owners get a clear, navigable framework.

The financing posture is accommodating for a loft co-op. Listing records indicate 80 percent financing, with pieds-à-terre and co-purchasing welcomed — materially looser than old-guard co-op regimes. Run the Co-op Board Qualification Calculator before offering and verify current terms.

Underwrite the operational record. The gas-line, ventilation, boiler, and security work is documented in board communications on file, along with the reserve position as of 2020. Your attorney should review the current financial statements against that baseline — the trajectory matters as much as the snapshot.

Renovation is a board process, not a Landmarks process. The building is not landmarked, so envelope constraints are conventional; interior loft renovations need board sign-off per the house rules. Run the Renovation Cost Calculator on raw or dated units.

Sell the scarcity, specifically. Boutique loft co-ops with 15-foot ceilings at a transit nexus are a thin market on the Sixth Avenue spine. Name the structural facts — conversion history, ceiling heights, the documented capital work — rather than reaching for adjectives.

Position against the Village loft premium. Your buyer is cross-shopping Village, NoHo, and Flatiron lofts at materially higher per-foot pricing. The pitch is like-for-like architecture at a discount, with the same subway map.

Condition transparency wins in a thin-comp building. The renovated-versus-raw spread here is wide and known. Price to condition and line honestly; we support pricing with adjacent-building loft comparables where same-building history is sparse.

If you're considering 100 West 15th Street, also evaluate:

• The Mark Twain (100 West 12th Street) — the post-war co-op alternative three blocks south on the same avenue; conventional layouts instead of lofts at a similar entry tier
• 252 Seventh Avenue (The Chelsea Mercantile) — Chelsea's full-service loft condominium; the scale, amenity, and price step-up
• The O'Neill Building (655 Sixth Avenue) — landmark Ladies' Mile cast-iron condo conversion a few blocks north; the trophy-loft alternative on the avenue
• 111 Fourth Avenue — Union Square-side loft co-op; the closest like-for-like east of the square
• 15 Union Square West — glass-over-cast-iron condo conversion; the modern alternative at the square
• 59 West 12th Street — Emery Roth pre-war condominium nearby; the classic-apartment alternative
• 45 East 22nd Street — Flatiron's contemporary tower; the new-development contrast for buyers weighing character against amenities