21 South End Avenue, Manhattan, New York City: Apartment Building Renovation
Apartment Building Renovation at 21 South End Avenue, Manhattan, New York City was permitted on September 10, 2026 with a stated construction value of under $1M. Cooling tower upgrade. no change in use or egress. Builtie tracks the project's stage, the trades still being bought and the people who decide.
The same four steps, whether the buyer is a builder, a designer, an owner or a company you want to acquire.
The project
| Address | 21 South End Avenue, Manhattan, New York City |
| Project | Apartment Building Renovation |
| Building type | Residential |
| Work | Renovation or alteration |
| Permit issued | September 10, 2026 |
| Stated construction value | under $1M |
| Estimated stage | Permit |
| Company named on the permit | Reveal the builder — free trial |
| Decision makers and contacts | See who to contact — free trial |
From the permit: “Cooling tower upgrade. no change in use or egress”
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Where this project is
- March 25, 2026Alteration: mechanical · under $1M
- March 25, 2026Alteration · under $1M
- June 5, 2026Alteration: mechanical · under $1M
- June 6, 2026Interior alteration · under $1M
- July 3, 2026Interior alteration · under $1M
- September 10, 2026Alteration: Apartment Building Renovation · under $1M (this page)
- October 2026Estimated construction start (estimate)
- April 2027Estimated completion (estimate)
How we estimate: from the permit date and its stated value, with the build lengths Builtie's project feed uses (about 7 months for a job this size). It is not the builder's schedule.
Other big projects nearby
- 111 Wall Street, ManhattanAlteration CO: conversion to residential · $100M to $250M · April 2026
- 110 Maiden Lane, ManhattanAlteration CO: conversion to residential · $50M to $100M · July 2026
- 57 Broadway, ManhattanAlteration CO: conversion to residential · $50M to $100M · March 2026
- 100 William Street, ManhattanAlteration CO: conversion to residential · $50M to $100M · March 2026
- 97 Barclay Street, ManhattanAlteration · $50M to $100M · July 2026
57 projects of $1M+ were permitted within 1 km in the last 12 months. See them all in Builtie →
The company behind this project has 46 other projects in Builtie
- ████████ ConstructionNew York City · Alteration CO: facade work · under $1M · 2026
- ████████ ConstructionNew York City · Interior alteration · under $1M · 2026
- ████████ ConstructionNew York City · Interior alteration · under $1M · 2026
Which trades are being bought now
When each trade on this project is usually picked, in calendar months (estimate). As of October 2026: 7 to approach now.
| Trade | When to approach (est.) | Status |
|---|---|---|
| Construction (est.) | Oct 2026 – Apr 2027 | Estimate |
| Excavation and Site Work | Sep 2026 – Oct 2026 | Approach now |
| Construction Site Security | Sep 2026 – Nov 2026 | Approach now |
| Concrete and Foundation | Oct 2026 | Approach now |
| Structural Steel | Oct 2026 – Nov 2026 | Approach now |
| Elevators | Oct 2026 – Nov 2026 | Approach now |
| Framing | Oct 2026 – Nov 2026 | Approach now |
| Painting | Oct 2026 – Dec 2026 | Approach now |
How we estimate: each bar is the share of the build, from the estimated start (October 2026) to the estimated completion (April 2027) above, when the builder usually picks that trade. It is not the builder's schedule.
What Builtie adds
In Builtie: the decision makers on this project and their verified contacts, the trades already credited on it, the builder's other active permits, and LinkedIn and email outreach that runs while you work.
Other major projects in New York City
- 164 25 Street, Brooklyn: Office and Tenant Fit-Out
- 1338 Fteley Avenue, Bronx: Apartment Building Renovation
- 95 Ridgeway Avenue, Staten Island: Institutional Project Renovation
- 76 Pierrepont Street, Brooklyn: 4-Storey Apartment Building Renovation
- 271-11 76 Avenue, Queens: Institutional Project Renovation
All of them: construction projects in New York City by address. All five boroughs are in the feed, which has run since February 27, 2026. New York issues separate permits for each trade, so the firm named on a permit is often the trade contractor, an engineer or an expediter rather than the developer. Builtie groups the permits into projects and resolves the owner and builder separately.
Plans
Builtie's Starter plan is $79 per seat per month for 20 projects; Growth is $99 for 50 projects and adds the LinkedIn and email outreach you run yourself. Opening a project spends one credit, and the decision makers, emails, phones and AI call script inside it are included. Your monthly credits reset at each renewal, and extra credit packs are valid for 30 days. The free trial runs 7 days with 10 projects. Custom, where Builtie's team runs the outreach for you, starts from $1,500 a month on top of a Growth seat.
Frequently asked questions
What is being built at 21 South End Avenue, Manhattan?
Apartment Building Renovation. Cooling tower upgrade. no change in use or egress
When was the permit issued for 21 South End Avenue, Manhattan?
September 10, 2026, by New York City.
Who is building 21 South End Avenue, Manhattan?
Builtie resolves the builder or general contractor behind the permit and attaches a verified decision maker.
Which trades does 21 South End Avenue, Manhattan need now?
Estimated as of October 2026, the trades to approach now are excavation and site work; site security; concrete; structural steel; elevator; framing; painting.
What does Builtie cost?
Starter is $79 per seat per month for 20 projects; Growth is $99 for 50 projects and adds LinkedIn and email outreach. There is a 7-day free trial with 10 projects.