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Flatiron / Union Square

Prewar loft conversions, late-20th-century office-to-residential conversions, and a handful of 2010s+ new-construction towers. The Flatiron / Union Square corridor has a high concentration of large floor-plate loft buildings, which translates into atypical FISP scopes and HVAC complexity.

ZIP Codes 10003, 10010, 10016
Typical Price Range $800K – $8M+
Subway Access L, N, Q, R, W, 4, 5, 6 at Union Square; F, M at 23rd Street

Building Stock

Pre-1930 loft buildings converted in the 1980s-2000s (Park Avenue South, Fifth Avenue south of 23rd, Broadway). New-construction luxury at 15 Union Square West, 35 East 19th, 200 East 21st. A smaller cohort of postwar office buildings recently converted to residential.

Active Managing Agents

The most common managing agents operating in Flatiron / Union Square include:

See our full managing agent directory for violation records, portfolio size, and composite performance scores.

Key Issues to Watch For

  • Large loft floor plates require non-standard HVAC and life-safety configurations; mechanical replacement cycles are expensive.
  • Office-to-residential conversions sometimes carry residual commercial systems (chillers, redundant electrical) with maintenance obligations the unit owners inherit.
  • Sponsor units retained as rentals are common in 1980s-90s loft conversions; verify how sponsor conversion progressed before assuming current control.
  • Common charges on large floor-plate units can run materially higher per square foot than smaller units in the same building because allocation formulas favor smaller layouts.

Local Law 11 / FISP Exposure

Pre-1930 loft buildings carry old structural and masonry systems; FISP findings vary widely. SWARMP filings are common; verify the building's progress against its last remediation plan.

For a complete explanation of how Local Law 11 compliance — and non-compliance — affects your carrying costs, read our full LL11 briefing.

Flatiron / Union Square at a Glance

77 Buildings audited of ~519 condo/co-ops in area (14.8%)
276 HPD Class C violations Immediately hazardous, across audited buildings
1,820 HPD violations (all classes) A, B, and C combined
12,111 311 complaints Resident-filed across audited buildings

Aggregate counts roll up only the buildings we have audited so far. Coverage expands as we score more buildings.

Highest-Risk Buildings in Flatiron / Union Square

Ranked by composite risk score (HPD violations weighted by severity + 311 complaints + ECB fines + HPD litigation). Click any building for the full forensic profile.

# Address Managing Agent HPD-C Total Viol. 311 Risk Score
1 330 East 24 Street FirstService Residential 35 195 1110 10,568
2 333 East 30 Street AKAM Associates 10 142 503 5,779
3 35 East 35 Street FirstService Residential 42 208 259 4,603
4 350 East 30 Street AKAM Associates 11 114 384 4,592
5 200 East 27 Street AKAM Associates 9 149 371 4,057
6 101 3 Avenue FirstService Residential 26 74 224 3,411
7 303 East 12 Street FirstService Residential 17 126 430 3,219
8 28 East 10 Street FirstService Residential 14 89 200 2,747
9 320 East 25 Street FirstService Residential 10 42 249 2,626
10 543 3 Avenue AKAM Associates 3 49 139 2,440

Managing Agents Operating in Flatiron / Union Square

Ranked by number of audited buildings under management. From HPD Registration filings.

  1. FirstService Residential 46 buildings
  2. AKAM Associates 31 buildings

Your Elected Representatives

NYC condo & co-op governance reform happens in Albany and at City Hall. These are the lawmakers covering this neighborhood.

NY Assembly District 66 Deborah J. Glick
NY State Senate District 27 Brian P. Kavanagh
NYC Council District 2 Harvey Epstein
US Congress District NY-10 Daniel S. Goldman

Generate a letter to your representative →

Before You Sign a Contract

  1. Pull the building's record — use our building search to get HPD violations, DOB complaints, managing agent history, and composite risk.
  2. Read the full offering plan and last three annual financial statements — don't accept a summary.
  3. Check the reserve fund — benchmarks vary by building age and size, but thin reserves are the canary for upcoming special assessments.
  4. Ask about upcoming capital projects — facade, elevator, lobby, roof, mechanical — and pin down the budget.
  5. Verify the tax abatement status — if 421-a or another abatement is expiring, model the reset on your carrying costs 5 and 10 years out.
  6. Search NYSCEF for active litigation — against the board, the managing agent, or the sponsor LLC.

Frequently Asked Questions

Is Flatiron / Union Square a good place to buy a condo or co-op?

Flatiron / Union Square can be a good buy, but only with building-specific due diligence. Prewar loft conversions, late-20th-century office-to-residential conversions, and a handful of 2010s+ new-construction towers. The Flatiron / Union Square corridor has a high concentration of large floor-plate loft buildings, which translates into atypical FISP scopes and HVAC complexity. Use our building search to pull the specific property's violation record, managing agent history, and risk score before you commit.

What managing agents operate in Flatiron / Union Square?

Major managing agents active in Flatiron / Union Square include FirstService Residential, AKAM Associates, Halstead Management, Brown Harris Stevens. Each has a different portfolio size, service tier, and violation track record — check each one's profile on our managing agent directory before bidding on a building managed by any of them.

What are the most common issues in Flatiron / Union Square buildings?

Large loft floor plates require non-standard HVAC and life-safety configurations; mechanical replacement cycles are expensive. Office-to-residential conversions sometimes carry residual commercial systems (chillers, redundant electrical) with maintenance obligations the unit owners inherit. For the full list of risks to verify before signing a contract, read the main neighborhood briefing above.

How does Local Law 11 / FISP affect Flatiron / Union Square buildings?

Pre-1930 loft buildings carry old structural and masonry systems; FISP findings vary widely. SWARMP filings are common; verify the building's progress against its last remediation plan. Our full LL11 guide explains what to look for in any facade report: condoscoopsnyc.org/issues/local-law-11-cost-opacity/

Related Resources

This guide is a due-diligence briefing — not a lifestyle review. For building-specific data (violations, managing agent, litigation history), use our building search. Have a Flatiron / Union Square story to share? Tell us what happened.