N.Y.C. Admin. Code § 27-237: § 27-237 Occupancy groups.

Table 3-1 lists occupancy groups and sub groups that shall be established for classifying buildings and spaces in accordance with the provisions of articles three through twelve of this subchapter.

TABLE 3-1 Occupancy Classifications

Occupancy Group

Classification

Fire Index

A

High hazard

4

B-1

Storage (moderate hazard)

3

B-2

Storage (low hazard)

2

C

Mercantile

2

D-1

Industrial (moderate hazard)

3

D-2

Industrial (low hazard)

2

E

Business

2

F-1a

Assembly (theaters, etc.)

1

F-1b

Assembly (churches, concert halls, etc.)

1

F-2

Assembly (outdoors)

1

F-3

Assembly (museums, etc.)

1

F-4

Assembly (restaurants, etc.)

1

G

Education

1

H-1

Institutional (restrained)

1

H-2

Institutional (incapacitated)

1

J-1

Residential (hotels, etc.)

1

J-2

Residential (apartment houses, etc.)

1

J-3

Residential (one- and two-family dwellings)

1

K

Miscellaneous