Class C Buildings - Walk Up Apartments
C0 – Three Families
Three Families
Properties in the C0 building class are 3-family walk-up apartment buildings. C0 is by far the most numerous among all class C buildings, accounting for 54% of them. 49% of all properties in the C0 class are in Brooklyn, with 33% in Queens and 15% in the Bronx.
The top 5 neighborhoods with the biggest numbers of properties in the C0 building class are Borough Park (Brooklyn), Bensonhurst West (Brooklyn), Elmhurst (Queens), Stuyvesant Heights (Brooklyn) and Astoria (Queens).

C1 – Over Six Families Without Stores
Over Six Families Without Stores
The C1 building class comprises buildings that accommodate over 6 families and don’t have stores. Almost half of them (47%) are in Brooklyn, with 20% in the Bronx and 17% in Manhattan.
Here are the 5 neighborhoods with the greatest numbers of these buildings: Crown Heights North (Brooklyn), Astoria (Queens), Flatbush (Brooklyn), Greenpoint (Brooklyn) and Park Slope (Brooklyn).

C2 – Five to Six Families
Five to Six Families
Properties in the C2 class are buildings that accommodate 5 to 6 families. Over half of them (57%) are in Brooklyn, with 32% in Queens and 6% in the Bronx.
The top 5 neighborhoods with these buildings are Bushwick North (Brooklyn), Ridgewood (Queens), Astoria (Queens), Greenpoint (Brooklyn) and Bushwick South (Brooklyn).

C3 - Four Families
Four Families
Properties in the C3 class are four-family walk-up apartment buildings that are most numerous in Brooklyn (59%), Queens (22%) and the Bronx (12%).
The neighborhoods where these buildings are the most numerous are Ridgewood (Queens), Rugby / Remsen Village (Brooklyn), Bensonhurst West (Brooklyn), Carroll Gardens / Columbia / RedHook (Brooklyn) and Brownsville (Brooklyn).

C4 - Old Law Tenements
Old Law Tenements
Buildings in the C4 class are old law tenements built in New York City between 1879 and 1901. These buildings are also called “dumbbell tenements” because they are shaped like a dumbbell, wide at their edges and narrow in the middle. This was done in order to create air corridors between them. The majority of these buildings can be found in Manhattan (78%), Brooklyn (14%) and the Bronx (7%).
Buildings in the C4 class are most numerous in Hell’s Kitchen, East Village, Central Harlem South, Central Harlem North and Hudson Yards / Chelsea / Flatiron / Union Square, all in Manhattan.

C5 - Converted Dwelling or Rooming House
Converted Dwelling or Rooming House
The C5 building class comprises converted dwellings or rooming houses. Most of these buildings are found in Manhattan (79%) and Brooklyn (14%).
The neighborhoods with the biggest numbers of properties in the C5 building class are Upper West Side, Central Harlem North, Central Harlem South, Lincoln Square and Hamilton Heights, all in Manhattan.

C6 - Walk-up Cooperative
Walk-up Cooperative
Properties in the C6 class are walk-up coop buildings. 45% of them are in Manhattan, with 39% in Brooklyn and 10% in Queens.
Park Slope (Brooklyn), Upper West Side (Manhattan), West Village (Manhattan), Hudson Yards / Chelsea / Flatiron / Union Square (Manhattan) and Brooklyn Heights (Brooklyn) are the New York City neighborhoods where C6 buildings can be found in their biggest numbers.

C7 - Walk-up Apartments Over Six Families With Stores
Walk-up Apartments Over Six Families With Stores
The C7 building class comprises walk-up apartment buildings that accommodate over 6 families and have stores. They can be found mostly in Manhattan (60%), Brooklyn (20%) and the Bronx (15%).
They are in greatest numbers in Chinatown, East Village, Yorkville, SoHo / Tribeca / Civic Central / Little Italy and West Village (all 5 of them in Manhattan).

C8 - Walk-up Co-op; Conversion From Loft/Warehouse
Walk-up Co-op; Conversion From Loft/Warehouse
The C8 class comprises coop buildings converted from lofts or warehouses. There are only 18 such buildings in New York City, 12 in Manhattan and 6 in Brooklyn.
There are 9 of these buildings in Soho / Tribeca / Civic Central / Little Italy (Manhattan), 3 in Crown Heights North (Brooklyn) and one in each of the following neighborhoods: West Village (Manhattan), Stuyvesant Heights (Brooklyn), Upper West Side (Manhattan), North Side / South Side (Brooklyn), Chinatown (Manhattan) and Sheepshead Bay / Gerritsen Beach / Manhattan Beach (Brooklyn).

C9 - Garden Apartments/Mobile Home Park/Trailer Park
Garden Apartments/Mobile Home Park/Trailer Park
Properties in the C9 class are walk-up apartment buildings comprising garden apartments, or mobile home parks and trailer parks. They are distributed across the boroughs as follows: 184 are in Queens, 88 in Staten Island, 53 in both Brooklyn and the Bronx, and 48 in Manhattan.
The top 5 neighborhoods where these buildings can be found are Steinway (Queens), Kew Gardens Hills (Queens), Central Harlem North (Manhattan), Bayside / Bayside Hills (Queens), and BreezyPoint / BelleHarbor / RockawayPark / Broad Channel (Queens).
