Neighborhoods › Park Slope › Building 3023254
Interior renovation: Conversion of a two-family residence to a single-family…, est. $449K
509 6 Avenue, Brooklyn 90066 · Permit Entire
| Job | B01322734 (6 filings: I1, S1, S2, S4, S5, S3) · Alteration CO |
|---|---|
| Category | interior renovation |
| Estimated cost | $448,888 |
| Scale | 3 → 4 stories; 2 → 1 dwelling units; 1,932 sq ft |
| Work types | General Construction |
| Filed | Nov 23, 2025 |
| Professional | Appel Architecture, Dpc |
| Building | BIN 3023254 · BBL 3010300005 |
| Official record | DOB NOW job B01322734 |
DOB description
B01322734-I1: CONVERSION OF A TWO-FAMILY RESIDENCE TO A SINGLE-FAMILY RESIDENCE. A NEW STORY IS PROPOSED AND A NEW CERTIFICATE OF OCCUPANCY WILL BE OBTAINED.
B01322734-S1: STRUCTURAL ALTERATION FOR INTERIOR RENOVATION SCOPE. REINFORCEMENT OF EXISTING JOISTS VERTICAL ADDITION.
B01322734-S2: SCOPE OF WORK: RENOVATION & CONVERSION OF 2-FAMILY HOUSE TO 1-FAMILY HOUSE. PLUMBING WORK ON CEL, BAS, 1STFLOOR, 2ND FLOOR, & 3RD FLOOR PER PLANS. WORK TO INCLUDE:MODIFICATIONS TO EXISTING WATER, SANITARY, ANDGAS FIXTURES / PIPING THROUGHOUT BUILDING
B01322734-S4: INSTALLATION OF A NEW SPRINKLER SYSTEM IN A ONE FAMILY HOME. NO CHANGE OF USE, EGRESS OR OCCUPANCY UNDER THIS APPLICATION.
B01322734-S5: Renovation & conversion of a 2 family house to 1 family house. Mechanical work on Cel, Bas, 1st, 2nd & 3rd floors per plans. Work to include New venting in bathrooms & kitchen. New mini split system throughout. New radiators as noted.
B01322734-S3: FOUNDATION WORK ASSOCIATED WITH THE CONVERSION OF A TWO FAMILY TO A ONE FAMILY.
Status timeline
- Nov 23, 2025 — New job filed (Permit Entire) B01322734-I1
- Dec 29, 2025 — New job filed (Permit Entire) B01322734-S1
- Feb 2, 2026 — New job filed (Permit Entire) B01322734-S2
- Feb 2, 2026 — New job filed (Permit Entire) B01322734-S3
- Feb 4, 2026 — New job filed (Permit Entire) B01322734-S4
- Apr 21, 2026 — New job filed (Permit Entire) B01322734-S5
- Jun 14, 2026 — Permit issued — work can start (Plumbing) B01322734-S2
- Jun 15, 2026 — Permit issued — work can start (Permit Entire) B01322734-S2
- Jul 28, 2026 — Permit issued — work can start (Mechanical Systems) B01322734-S5
- Jul 29, 2026 — Permit issued — work can start (Permit Entire) B01322734-S5
- Aug 10, 2026 — Permit issued — work can start (Foundation) B01322734-S3
- Aug 11, 2026 — Permit issued — work can start (Permit Entire) B01322734-S3
- Aug 13, 2026 — Permit issued — work can start (Sprinklers) B01322734-S4
- Aug 14, 2026 — Permit issued — work can start (Permit Entire) B01322734-S4
- Aug 16, 2026 — Permit issued — work can start (General Construction) B01322734-I1
- Aug 17, 2026 — Permit issued — work can start (Permit Entire) B01322734-I1
- Sep 17, 2026 — Permit issued — work can start (Structural) B01322734-S1
- Sep 18, 2026 — Permit issued — work can start (Permit Entire) B01322734-S1
Work permits
| Permit | Work | Status | Issued | Expires |
|---|---|---|---|---|
| B01322734-S1-ST | Structural | Permit Issued | Sep 17, 2026 | Dec 31, 2026 |
| B01322734-I1-GC | General Construction | Permit Issued | Aug 16, 2026 | Jan 1, 2027 |
| B01322734-S4-EW-SP | Sprinklers | Permit Issued | Aug 13, 2026 | Apr 30, 2027 |
| B01322734-S3-FO | Foundation | Permit Issued | Aug 10, 2026 | Jan 1, 2027 |
| B01322734-S5-MS | Mechanical Systems | Permit Issued | Jul 28, 2026 | Apr 30, 2027 |
| B01322734-S2-PL | Plumbing | Permit Issued | Jun 14, 2026 | May 1, 2027 |
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