Sapphire Street rezoning hearing: City Planning Commission heard technical answers about a wet‑floodproofed cellar and a permeable gabion wall at 13527 Sapphire Street, and the applicant said the cellar will start as a wet system and be retrofitted to dry floodproofing only if the Department of Transportation raises Sapphire Street in the future.
# What’s happening
– City Planning Commission heard the 13527 Sapphire Street rezoning presentation.
– Applicant will start with a wet‑floodproofed cellar and gabion wall, then retrofit to dry floodproofing if grade rises.
– DOT’s planned street‑raising has no timeline; effects are contingent on future DOT action.
# Why it matters
– Residents near Sapphire Street and future building tenants face cellar flooding and street‑grade changes.
– The retrofit timing and responsibility affect who must pay for future floodproofing and street/infrastructure work.
# Key details
– Meeting: City Planning Commission public meeting, July 29, 2026.
– Project: 13527 Sapphire Street rezoning, Community District 10, Queens.
– Proposed building: roughly 268 dwelling units, with about 67 affordable units and 118 parking spaces.
– Flood approach: cellar designed as wet‑floodproofed with an exterior gabion (permeable rock) wall; habitable floors elevated above flood plane.
– Street‑raising: proposal would raise 79th Street ~1 foot and Sapphire Street nearly 10 feet under the Jewel Streets plan; no DOT timeline given.
– Stormwater measures: blue‑roof retention (4–6 inches) and potential detention tanks in cellar storage areas.
Main article body
The City Planning Commission (CPC) reviewed the 13527 Sapphire Street rezoning on July 29, 2026, and the applicant presented a resiliency approach that starts with a wet‑floodproofed cellar behind a permeable gabion wall, with residential units placed above the flood‑prone levels. Source: https://s-media.nyc.gov/agencies/dcp/assets/files/pdf/about/commission/public-meetings/2026-07-29cal.pdf and https://youtu.be/d5jlmZf6shY&t=877
13527 Sapphire Street project — fact block
– Role or jurisdiction: Applicant team for a proposed rezoning at 13527 Sapphire Street, Queens.
– Action taken or responsibility: Presented a six‑story residential project and resiliency design to the City Planning Commission.
– Relevant numbers or dates: ~268 units, ~67 affordable units, ~118 parking spaces; CPC hearing July 29, 2026.
Source: https://youtu.be/d5jlmZf6shY&t=877
Department of Transportation (DOT) — fact block
– Role or jurisdiction: City agency responsible for street reconstruction and roadway grade changes.
– Action taken or responsibility: Identified in the Jewel Streets plan as the agency that would perform street‑raising; no timeline provided at the hearing.
– Relevant numbers or dates: Applicant said Sapphire Street could be raised nearly 10 feet under the plan.
Source: https://youtu.be/d5jlmZf6shY&t=1720
At the July 29 presentation, project architects described the cellar parking as “wet floodproofed” and protected with an exterior gabion wall — described in the presentation as a permeable rock surface that allows floodwater to pass through the cellar area rather than creating a solid, dry basement. The design places occupiable residential floors above the mapped flood levels. Source: https://youtu.be/d5jlmZf6shY&t=1117
The applicant told commissioners and community members that the project is being designed to work in two scenarios: (1) if DOT does not raise Sapphire Street in the near term, the cellar will operate as a wet‑floodproofed space that allows water in and out; (2) if DOT later raises street grade, the team intends to transition the cellar to a dry‑floodproofed condition and install floodgates or other barriers. The team said they would need to retrofit the cellar to dry floodproofing once the surrounding grade is elevated. Source: https://youtu.be/d5jlmZf6shY&t=1506
The applicants explained how the gabion wall would perform over time: the above‑grade gabion will remain a permeable, aesthetic surface today, while sections below future street grade would become a below‑grade foundation element. If the streets are raised, the team plans to pour a new solid concrete wall with a weather barrier behind the existing stone gabion, effectively “abandoning” the stones in the backfill so they become part of the foundation system. The project team characterized the gabion approach as economical, noting it uses materials similar to highway dividers. Source: https://youtu.be/d5jlmZf6shY&t=1572 and https://youtu.be/d5jlmZf6shY&t=1645
The hearing record does not include a line item or estimate for the cost of that future retrofit or for long‑term gabion maintenance. The applicant described the gabion as an economical system and said stones would be left in place and the poured concrete wall and weather barrier would be added behind it when the grade is raised, but they did not provide maintenance‑cost figures at the CPC hearing. Source: https://youtu.be/d5jlmZf6shY&t=1572 and https://youtu.be/d5jlmZf6shY&t=1645
The project team did not state, at the July 29 hearing, who would pay for later retrofits to convert the cellar from wet to dry floodproofing if DOT raises Sapphire Street in the future. In earlier CPC review sessions and agency briefings (outside the July 29 meeting), presenters explained that costs for constructing and maintaining new streets, water and sewer infrastructure are generally the developer’s responsibility until the city accepts transfer of the street title; that earlier coverage frames who typically carries costs for street works and utility changes. (This is earlier coverage from a separate CPC review session.) Source (earlier meeting): https://youtu.be/giqzIwTGKSo&t=4017
The applicant described additional stormwater and resiliency measures that could reduce reliance on cellar interventions: a blue‑roof retention system intended to capture about 4–6 inches of water on an elevated roof and the potential to install detention tanks in cellar storage if needed. The team said those systems are typical for New York City and would be used to meet the Department of City Planning and Department of Environmental Protection rules for on‑site stormwater management. The hearing record does not include cost estimates or a maintenance schedule for the detention tanks, blue roof, or floodgates. Source: https://youtu.be/d5jlmZf6shY&t=1645 and https://youtu.be/d5jlmZf6shY&t=1277
Community board members asked for a technical section explaining the two scenarios (wet system if the street is not raised; retrofit to dry floodproofing if it is), and the applicant agreed to include that explanatory material in its design submissions for the board and public record. Commissioners also asked for written documentation and technical calculations showing how the resiliency measures would function under each scenario. Those follow‑up materials were requested at the hearing. Source: https://youtu.be/d5jlmZf6shY&t=1506
What to watch next
– The applicant’s promised technical write‑up explaining wet‑to‑dry transition details and any retrofit cost estimates. Source: https://youtu.be/d5jlmZf6shY&t=1506
– Any DOT schedule or formal decision on raising Sapphire Street under the Jewel Streets plan; the project’s long‑term floodproofing strategy depends on that timeline. Source: https://youtu.be/d5jlmZf6shY&t=1720
If you want the specific timestamps for the excerpts cited here, they are included in the CPC video of the July 29, 2026 meeting and in the linked earlier CPC sessions referenced above. Source: https://youtu.be/d5jlmZf6shY and https://youtu.be/giqzIwTGKSo&t=4017
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