# 171 5th Avenue, Manhattan

Commercial · built c. 1903 · Block 851, Lot 1.

On Umarelli: https://umarelli.org/nyc/1008510001/171-5-avenue

More construction in Flatiron: https://umarelli.org/nyc/manhattan/flatiron.md

## Building permits

- Alteration, filed Sep 11, 2026, estimated cost $1K, described as “This application is filed for a temporary use permit for a sales office pursuant to sectionac-28-111 and buildings bulletin 2010-002.application filed in conjunction with NB# M01011711-I1.”
- Alteration, filed Jun 17, 2026, estimated cost $8K, described as “Four non-illuminated non-advertising accessory storefront awnings approved by NYC landmark preservation commission LPC docket# 25-12143 and 26-00057. No change of use, egress or occupancy.”
- Alteration, filed Jun 17, 2026, estimated cost $4K, described as “Two non-illuminated non-advertising accessory storefront awnings approved by NYC landmark preservation commission LPC docket# 25-12143 and 26-00057. No change of use, egress or occupancy.”
- Alteration, filed May 20, 2026, estimated cost $1K, described as “New breeching and doublewall flue. All structual details, supports, gas, etc, filed under DOB now # M01011711. No change in means of egress use group or occupancy.”
- Alteration, filed Mar 12, 2026, estimated cost $120K, described as “Remove and cap plumbing fixtures as per plans”
- Alteration, filed Jan 9, 2026, estimated cost $5K, described as “Installation of a temporary scaffold as per plans in in conjunction with general construction. No change in use, egress or occupancy. Scaffold shall comply with 2022 NYC building code, chapter 33”
- Alteration, filed Nov 25, 2025, estimated cost $18K, described as “Installation of pipe scaffoldin around penthouse as per plans. Pipe scaffolding shall comply with chapter # 33 of the 2022 code, no changess in use in egress or occupancy under this application.”
- Alteration, filed Jul 2, 2025, described as “FISP INSPECTION (Facade Inspection Safety Program). INDUSTRIAL ROPE ACCESS TECHNIQUES AND METHODS. SEE ATTACHED PLANS. Designated Primary Site supervisor: Jesus Decola”
- Alteration, filed Aug 20, 2024, estimated cost $1K, described as “Installation of temporary material hoist as per plan. No change in use, egress, or occupancy. Material hoist inside the building from the sub-cellar. Cellar, first floor to the mezzanine level.”
- Alteration, filed Jul 16, 2024, estimated cost $41K, described as “Conversion from Wet to Dry standpipe system as per plan filed within. PAA filed to reflect in field conditions.”
- Alteration, filed Jul 3, 2024, estimated cost $3K, described as “Temporary construction fence as per drawings. Construction fence shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application. Dot permits by others for fence installed on sidewalk/roadway.”
- Alteration, filed Jun 18, 2024, estimated cost $5K, described as “Installation of a temporary roof material hoist as per plans in in conjunction with general construction. No change in use, egress or occupancy. Material hoist shall comply with 2022 NYC building code, chapter 33.”
- Alteration, filed May 15, 2024, estimated cost $10K, described as “Installation of temporary construction fence as per plans during general construction work. No change in use, egress or occupancy. Fence to comply with chapter 33 of NYC building code of 2022.”
- Alteration, filed May 15, 2024, estimated cost $4.0M, described as “MPP# 235. Means and methods related to structural demo. Filed in conjunction with M01011711-I1/S1.”
- Alteration, filed May 9, 2024, estimated cost $50K, described as “MPP# 235. Remove portion of 1st floor slab for installation of future temporary hoist. No Change in use, egress or occupancy.”
- Alteration, filed May 9, 2024, estimated cost $729K, described as “MPP# 235. Interior demolition of cellar and sub-cellar as per pans. No change in use, egress or occupancy.”
- Alteration, filed May 2, 2024, estimated cost $20K, described as “Installation of temporary construction hoist as per plans during general construction work. No change in use, egress or occupancy. Hoist installed in accordance with 2022 nycbc, chapter 33.”
- Major Renovation — Conversion, filed Mar 20, 2024, estimated cost $11.8M, 36 units added, 23 stories, described as “MPP# 235. Install new elevators and egress stairs in existing office building. Convert building to residential mixed use and obtain new Certificate of Occupancy.”
- Alteration, filed Mar 14, 2024, estimated cost $2K, described as “Alteration application filed herewith for temporary stair at first floor and first floor mezzanine. No change in use, occupancy or egress under this application”
- Alteration, filed May 31, 2023, estimated cost $45K, described as “T-mobile-- modifications to existing sprinklers and standpipe systems for retail renovation.”
- Alteration, filed Apr 25, 2023, estimated cost $38K, described as “Remove fuel oil tank. Filed in conjunction with emergency laa application number M00862573.”
- Alteration, filed Mar 1, 2023, estimated cost $60K, described as “Tmobile-- installation of structural support framework for future art installation inconjunction with retail remodel.”
- Alteration, filed Feb 28, 2023, estimated cost $29K, described as “Tmobile-- plumbing modifications and installations for retail remodel.”
- Alteration, filed Feb 28, 2023, estimated cost $36K, described as “Tmobile-- mechanical modifications and installation for retail remodel.”
- Alteration, filed Feb 28, 2023, estimated cost $190K, described as “Tmobile-- general construction inclusive of modifications to interior partitions for retail remodel as per plans filed. No change to use, egress, or occupancy.”

14 more, older permits are in this building’s full list on the map: https://umarelli.org/nyc/1008510001/171-5-avenue.

## Property taxes

- Assessment: $23,384,700
- 2026–27 tax: $2,471,582
- Market value (city estimate): $51,966,000
- Taxable value: $22,783,761
- Assessed land: $6,300,000
- Assessed improvements: $17,084,700

## Zoning

C6-4M: floor area ratio 21.21 built, above the 10.00 base zoning allows, which bonuses, transfers or older rules can permit.

## Recent sales

- Oct 25, 2023: $6,708,387

Open-market sales since 2016, from the Department of Finance’s sales files.

## Flood zone

Current FEMA flood map: zone X, minimal flood hazard.

## Landmarks

Part of Flatiron Building: Individual Landmark, Ladies' Mile Historic District (Historic District). 50 Landmarks Preservation Commission permits are on file.

## Board and land use applications

- Flatiron Residential Conversion - 175 Fifth Avenue (City Planning 2024M0252): Certification, Authorization, Completed, filed Sep 3, 2024. A private application to facilitate a residential conversion is being sought by Flatiron Owner LLC at 175 Fifth Avenue in Manhattan, Community District 5.
- Flatiron BID Expansion (City Planning 2021M0260): Business improvement district, Completed, filed Nov 30, 2020, decided May 19, 2021. An application from the Small Business Services (SBS) on behalf of the Flatiron Business Improvement District (BID) to modify the existing plan and expand the BID in Community Districts 4 and 5 of Manhattan.

## In the news

[Flatiron Building Finishes Residential Conversion at 175 Fifth Avenue In Flatiron, Manhattan](https://newyorkyimby.com/2026/11/flatiron-building-finishes-residential-conversion-at-175-fifth-avenue-in-flatiron-manhattan.html), New York YIMBY, Nov 2, 2026.

From New York City and Jersey City public records, refreshed within a day of each release. Sources: https://umarelli.org/sources. Methodology and corrections: https://umarelli.org/methodology