The Hard Lesson Behind the 2023 Manhattan Parking Garage Collapse
On April 18, 2023, a five-story parking garage at 57 Ann Street in Lower Manhattan collapsed, killing one person and injuring five others. The building was 98 years old. On April 28, 2025 — nearly two years later — the New York City Department of Buildings and the Manhattan District Attorney’s office released the findings of a joint investigation. What the investigation revealed was not a mystery: it was a preventable structural failure caused by a single incorrect assumption made during demolition work. A critical brick and mortar pier was removed by workers who believed a steel column was inside. There was no steel column. The pier was load-bearing masonry. When it was removed, the structure above it had nothing left to carry its weight.
- 57 Ann Street, Lower Manhattan — partial collapse on April 18, 2023; one fatality, five injured
- Building was 98 years old; collapse occurred during demolition work
- Cause: workers removed a load-bearing brick pier believing it concealed a steel column — it did not
- DOB and Manhattan DA’s joint investigation released April 28, 2025
- The collapse illustrates why engineering review and inspection requirements exist — not as bureaucracy, but as the check on assumptions that save lives
What Caused the 57 Ann Street Garage Collapse?
Workers removed a load-bearing brick pier during demolition, believing it concealed a steel column. It did not. The 98-year-old five-story garage at 57 Ann Street in Lower Manhattan partially collapsed on April 18, 2023, killing one person and injuring five others.
| Factor | Detail |
|---|---|
| Age of Structure | The garage was built in 1925 — 98 years old at the time of collapse. Structures of this age require careful engineering review before any demolition or structural modification because original construction documents may be incomplete, inaccurate, or absent. |
| Incorrect Assumption About Structure | Workers believed the brick and mortar pier they were removing concealed a steel column inside. This assumption was made without engineering verification. There was no steel column — the pier itself was the structural element carrying the load above. |
| Removal of Load-Bearing Element | The pier was a critical load-bearing element supporting the structure above. Removing it without shoring or any engineering assessment removed the only support for a significant portion of the building’s weight. |
| No Engineering Review Before Demolition | Proper structural demolition in a building of this age requires engineering review of existing conditions before any structural elements are disturbed. The work proceeded on the basis of assumption rather than analysis. |
| Consequence | The structure above the removed pier lost its support and collapsed. One person was killed. Five were injured. The building was a total loss. A two-year criminal and regulatory investigation followed. |
What Would Proper Engineering Review Have Caught?
| Step | What It Would Have Revealed |
|---|---|
| Licensed Engineer Review of Existing Conditions | An engineering review of the existing structure would have identified the pier as load-bearing masonry and flagged it as a structural element that could not be removed without shoring and a demolition sequence plan |
| DOB Permit for Demolition/Structural Work | A permit application for structural demolition would have required submission of engineering drawings showing the work scope and sequence; a DOB examiner would have reviewed the proposed work against building codes and structural requirements |
| Structural Investigation of the Existing Building | A structural investigation report on a 98-year-old building would have documented the actual construction — no steel columns in masonry piers — and informed the demolition approach accordingly |
| DOB Inspection of Work in Progress | A required progress inspection by a DOB inspector or special inspector would have identified that work was proceeding on structural elements without engineering oversight |
| Shoring Plan Before Any Load-Bearing Removal | Any permitted demolition of load-bearing elements requires a shoring plan — a temporary support structure that carries the load above while the structural element is removed or modified; no such plan existed |
The workers at 57 Ann Street were not acting maliciously. They were acting on an incorrect assumption. The entire system of permits, engineering review, and inspections exists precisely to catch incorrect assumptions before they become irreversible. An engineer reviewing the existing conditions would have identified the pier as structural masonry. A DOB examiner reviewing permit drawings would have flagged the need for a shoring plan. An inspection would have stopped the work if it was proceeding without required oversight. Each step in the compliance process is a checkpoint. When those checkpoints are skipped — whether to save time, save money, or simply because the owner or contractor didn’t know they were required — the consequences fall on workers, bystanders, and the public. The 2023 Ann Street collapse is not an argument against development or demolition. It is an argument for doing it right.
For Title Companies · Property Managers · Real Estate Firms
Need an expediter you can call on every transaction?
All Boro Expediter works directly with title companies, real estate attorneys, property managers, and investors across all five NYC boroughs. Every violation type. Every borough. One contact for your whole book of business.
What Does the 57 Ann Street Collapse Mean for Property Owners?
The lesson from 57 Ann Street applies to property owners at every scale, not just large commercial demolition projects. Any time structural work is contemplated — removing walls, modifying load-bearing elements, demolition, additions — the first step is engineering review of the existing conditions. This is not optional and it is not a formality. For older buildings, the original construction may not match what later modifications created. For masonry buildings, the structural logic may be different from what you’d expect in modern construction. Assumptions about what is structural and what is not can be catastrophically wrong without professional review.
The permit and inspection process exists to catch these assumptions before they become disasters. Engaging a licensed engineer before any structural work is the most direct way to ensure that what happened at 57 Ann Street does not happen on your property.
Frequently Asked Questions
What caused the 2023 parking garage collapse in NYC?
According to the joint investigation released by DOB and the Manhattan District Attorney’s office on April 28, 2025, the collapse at 57 Ann Street was caused by the removal of a load-bearing brick and mortar pier during demolition work. Workers believed the pier contained a steel column inside and removed it without engineering verification. The pier was in fact structural masonry — not steel-encased — and its removal eliminated the structural support for the floors above. The structure collapsed, killing one person and injuring five. The building was 98 years old.
What does this case teach property owners about structural compliance?
The 57 Ann Street collapse is a direct illustration of what the permit and inspection system is designed to prevent. A licensed engineer reviewing existing conditions would have identified the pier as load-bearing masonry. A DOB permit application would have required engineering drawings and a shoring plan. A required inspection would have caught work proceeding without proper oversight. Each compliance step is a checkpoint against the kind of incorrect assumption that caused this collapse. For property owners, the takeaway is straightforward: never proceed with structural work based on assumptions. Always engage a licensed engineer before any structural element is disturbed, particularly in older buildings where original construction may differ from expectations.
How can property owners ensure structural work is properly reviewed?
The first step is to engage a licensed professional engineer before any structural work is planned or scoped. The engineer should review existing conditions — which may include reviewing original drawings if available, conducting a physical investigation, and assessing the actual structural system rather than assuming. Any structural work then requires a DOB permit, which requires engineering drawings stamped by a licensed professional. The permit process includes examiner review and inspection requirements. Completing the full process — engineering review, permit, inspection, sign-off — is the way to ensure work is done safely and with the legal protection of proper compliance.
