What is NYC Class K?
Class K covers primarily commercial retail buildings — standalone stores, small shopping strips, and ground-level retail without significant residential. Distinct from Class S, which is primarily residential with commercial.
Family: Commercial · Approximate NYC count: ~11,000 store buildings citywide
Typical characteristics
- Primarily commercial (retail, services)
- Limited or no residential component
- Street-level storefront common
- Typically 1–4 stories
- Found on commercial corridors across all boroughs
Applicable laws & regulations
- ADA accessibility for retail (Title III)
- DOB use permit / C of O compliance with current retail use
- Commercial waste franchise (DSNY) requirements
- Sign permits (LL28 and DOB sign regulations)
- Fire alarm / sprinkler compliance
Common compliance issues
- Sign violations (unpermitted storefronts)
- Unpermitted change of use (bodega → restaurant requires new C of O)
- Sidewalk obstructions (DSNY/DOT)
- Awning permit non-compliance
- Grease trap failures in food service tenants
Common zoning districts
Class K buildings are typically found in: C1-1 through C8-4
Zoning determines bulk, density, and use. Checking your building's zoning alongside its class reveals what's legally possible on the lot.
Class K sub-codes
| Sub-code | Meaning |
|---|---|
| K1 | One-story retail (store) |
| K2 | Multi-story department store |
| K3 | Multi-story retail |
| K4 | Predominantly warehouse retail (outlet) |
| K5 | Bank |
| K6 | Shopping center / strip mall |
| K7 | Supermarket |
| K8 | Big box retail |
| K9 | Miscellaneous retail |
Frequently Asked Questions
Where do I find my NYC building class?
Your building class is set by the NYC Department of Finance and published in PLUTO (Primary Land Use Tax Lot Output) maintained by the Department of City Planning. You can look it up by searching your address on RegWatch, or directly on the DCP ZoLa portal using the lot's BBL (Borough-Block-Lot).
Can my building's class change?
Yes, but it requires a formal change. A Class K designation reflects the building's current use and configuration. Renovations that change the fundamental use (adding units, converting commercial to residential, or condo conversion) require a new Certificate of Occupancy from DOB — which may result in a new class code being assigned by DOF on the next assessment.
What compliance obligations apply specifically to Class K?
ADA accessibility for retail (Title III). DOB use permit / C of O compliance with current retail use. Commercial waste franchise (DSNY) requirements. Full list above. Note that RegWatch property reports automatically calculate which obligations apply based on your building's specific characteristics (class, size, stories, construction year, occupancy).
Does a Class K designation affect resale value?
Indirectly — classification drives which regulations apply, which affects operating costs, insurance rates, and buyer expectations. Commercial classes (O, K) have different financing and diligence norms than residential (A–D). Mixed-use (S) adds complexity. Condos (R) are valued per-unit rather than per-building. Buyers and lenders always verify classification during due diligence.
How does RegWatch use building class data?
We use building class to determine which compliance obligations, deadlines, and violation patterns are relevant to each property. A Class D elevator building gets different risk flags than a Class B two-family home. This drives the per-property compliance calendar, risk scores, and vendor matching.
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