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4-bedroom apartment for sale in Midtown South-Flatiron-Union Square

6 W 20th St Fl 2, Midtown South-Flatiron-Union Square, Manhattan, New York, NY, 10011

$5,500,000
Asking price · in USD
Size
4,400 ft² (409 m²)
Available
Now

About this home

Apartment for sale in Midtown South-Flatiron-Union Square, Manhattan: 4 bedrooms, 3.5 bathrooms, 4,400 ft². Asking price $5,500,000. Built in 1907.

From the original listing · Realtor.comShow

Opportunities like this rarely come up in Flatiron. Unit 2 at 6 West 20th Street is a full-floor loft of approximately 4,100 square feet in The Greenwich Building, a 1907 Schwartz & Gross landmark in the heart of the Ladies' Mile Historic District. Here is the chance to buy a true full-floor loft in one of Manhattan's most sought-after neighborhoods, renovate it to your exact taste, and build significant value along the way. The loft already has a working kitchen and 1.5 baths. The rest is a vast, open space ready for your vision. Soaring 14-foot ceilings and giant original pivot windows fill the floor with north and south light, giving the space the volume and character that define classic pre-war loft living. With about 50 feet of frontage and a deep, regular floor plate, the layout can easily fit four bedrooms plus a home office, alongside generous living and dining space and a great room built for entertaining. The loft also has approximately 300 square feet of private outdoor space, a rare feature for a full-floor home in Flatiron. Picture morning coffee, summer dinners, or a planted garden retreat right off your living space. Bring your contractor and architect to build your dream home. With the floor wide open, you can design your home almost from scratch, from the number of bedrooms to every finish. Wet-over-dry layouts are permitted, giving you real freedom to place kitchens and bathrooms where they work best for your plan rather than where the building dictates. The upside is clear. A recently renovated full floor with the same footprint in this building is currently offered at $8,500,000 (without outdoor space). Buyers who want to create a custom home and build substantial equity at the same time will be hard pressed to find a better starting point in downtown Manhattan. The unit is currently approved for commercial use, however, the co-op board has confirmed it supports converting the unit to residential and is actively encouraging it, following the many floors above that have already made the change. This is a well-established path in the building, not an exception. The Greenwich Building is a boutique, 11-story neo-Renaissance co-op with a striking landmarked facade and only a handful of homes. Residents enjoy keyed elevator access to their floor, two elevators, a ButterflyMX virtual doorman, and a pet-friendly policy. Set just off Fifth Avenue on one of Flatiron's prettiest blocks, the building puts you steps from Madison Square Park, Union Square and its Greenmarket, Eataly, and some of the city's best restaurants and shops. A Citi Bike dock sits right across the street, and the subway lines at 23rd Street and Union Square are a short walk away. Buy it, renovate it, and build your dream home, with real value built in from day one. Several images have been virtually rendered. This unit requires a renovation.

Description from Realtor.com, shown as published there. See the original listing

Roofy listing score

Grade B, 70/100 · Complete

How complete and honest this listing is, from what the source sites show and Roofy’s own checks. It isn’t a rating of the home or the agent. How the score works

  • Photos25/25
    • Full points: 23 photos15/15
    • Full points: Large, clear photos (about 1,000 px)10/10
  • Details16/20
    • Full points: Price stated3/3
    • Full points: Bedrooms stated2/2
    • Full points: Bathrooms stated2/2
    • Full points: Size stated2/2
    • Does not apply: Move-in date: does not apply2/2
    • Does not apply: Lease length: does not apply1/1
    • Full points: Pet policy stated1/1
    • No points: Laundry not mentioned0/1
    • No points: Heat and utilities not mentioned0/1
    • No points: No amenities listed0/2
    • Full points: Description of 498 words3/3
  • True cost7/15
    • No points: No running costs stated (HOA, service charge or taxes)0/8
    • Full points: Price in line with similar homes in its neighborhood7/7
  • Accuracy12/15
    • Nothing to compare: Listed on one site, nothing to compare3/6
    • Full points: Agrees with city records (built 1907, 9 homes)5/5
    • Full points: Confirmed on its source site 3 days ago4/4
  • Legal10/10
    • Full points: No fair-housing problems found in the wording6/6
    • Full points: The agent’s license is active4/4
  • Trust0/15
    • No points: Not claimed on Roofy by the agent or owner0/10
    • No points: The agent is not verified on Roofy0/5

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Scored Nov 2, 2026 · Score version 1. No one can pay to change a score.

Buying costs

What this price means for you: the monthly payment, and New York’s mansion tax, which the buyer pays on a home of $1 million or more.

Compared with the area

Asks $5,500,000, 8% below the median asking price for homes for sale with 4+ bedrooms in Midtown South-Flatiron-Union Square.

Median here
$6,000,000
13 listings, last 90 days
Per ft²
$1,250 vs $1,657.40
This home vs the median, 25% lower

Asking prices of listings on Roofy and listing sites in the last 90 days, not signed leases or sale prices. One currency, never converted.

More about Midtown South-Flatiron-Union Square

Location

Location as the listing shows it.Open in Google Maps

Nearby transit

  • 23 StN R W4 min walk
  • 23 StF M5 min walk
  • 23rd Street (PATH)HOB-33 JSQ-33 JSQ-33 via HOB WTC-335 min walk

Nearby public schools · District 2

Distance only, not school zones. Check the zoned school with NYC Public Schools.

The building

9 units · 11 floors · built 1907 · 2 more homes listed here

Building record (NYC)

NYC records as of Nov 1 (weekly)

6 West 20 Street · BBL 1-00821-0049 · built 1907 · 9 units

Roofy building score 96/100 · Well keptAbout the building, from HPD violations. Not an inspection.
Building type
Office building
Open HPD violations
None
Heat complaints
0 this season
Complaints, last 12 months
0
Rent stabilization
May have stabilized units
Last sale (12-month file)
No sales in our 12-month file

No open immediately hazardous (Class C) violations.

See the full building record

Public NYC records about the building, not about the person listing it. Buyers and renters can see them on city websites too. Source: NYC Open Data (DCP PLUTO, HPD, DOF).

Added to Roofy Oct 29, 2026Last checked on Realtor.com Oct 29, 2026Roofy doesn’t verify listings. Never send money before seeing a home.

From Corrin Thomas

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