100 William Street, Manhattan, New York City: Office-to-Residential Conversion
Office-to-Residential Conversion at 100 William Street, Manhattan, New York City was permitted on March 3, 2026 with a stated construction value of $50M to $100M. Conversion from office (b) occupancy to residential (r-2) occupancy pursuant to article i, chapter v of the nyc zoning resolution and article 7b of the nys multiple dwelling law for residential conversion 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 | 100 William Street, Manhattan, New York City |
| Project | Office-to-Residential Conversion |
| Building type | Residential |
| Work | Renovation or alteration |
| Permit issued | March 3, 2026 |
| Stated construction value | $50M to $100M |
| Estimated stage | Foundation |
| Company named on the permit | Resolved in Builtie |
| Decision makers and contacts | In Builtie |
From the permit: “Conversion from office (b) occupancy to residential (r-2) occupancy pursuant to article i, chapter v of the nyc zoning resolution and article 7b of the nys multiple dwelling law for residential conversion”
Which trades are being bought now
The project is at the foundation stage. At that stage these trades are inside their award window, the stretch of the build when the builder or general contractor decides who gets the work:
| Trade | Award window |
|---|---|
| Construction Site Security | Before the start to 15% |
| Concrete and Foundation | Before the start to 5% |
| Structural Steel | 0% to 15% |
| Elevators | 0% to 20% |
| Framing | 0% to 20% |
| Painting | 5% to 35% |
| Masonry | 10% to 30% |
| Waterproofing | 10% to 35% |
| Roofing | 15% to 35% |
| Windows, Doors and Glazing | 15% to 35% |
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
- 57 Broadway, Manhattan: Office-to-Residential Conversion
- 110 Maiden Lane, Manhattan: 38-Storey Office-to-Residential Conversion
- 4012 Ft Hamilton Parkway, Brooklyn: 4-Storey School
- 1730 Broadway, Manhattan: Office-to-Residential Conversion
- 229 East 42 Street, Manhattan: Office-to-Residential Conversion
All of them: major construction projects in New York City. 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 (CAD) 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 CAD $1,500 a month on top of a Growth seat.
Frequently asked questions
What is being built at 100 William Street, Manhattan?
Office-to-Residential Conversion. Conversion from office (b) occupancy to residential (r-2) occupancy pursuant to article i, chapter v of the nyc zoning resolution and article 7b of the nys multiple dwelling law for residential conversion
When was the permit issued for 100 William Street, Manhattan?
March 3, 2026, by New York City.
Who is building 100 William Street, Manhattan?
Builtie resolves the builder or general contractor behind the permit and attaches a verified decision maker.
Which trades does 100 William Street, Manhattan need now?
At its current stage: site security, concrete, structural steel, elevator, framing, painting, masonry, waterproofing.
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.