Alcove - A small half a room or area adjoining the living room. Often converted to an additional separate room or used as dining area.

Brownstone or Townhouse - Structures that were originally built in the nineteenth or twentieth centuries. Originally built as luxurious one family homes, these houses usually feature fireplaces, moldings and other typical pre-war characteristics. Offers the luxury of a private home in the city and have largely been converted to multiple apartment buildings.

Classic 5, 6, 7,etc. - The "Classic" apartments are usually in prewar buildings and are built "old fashion" style, with maid's rooms and formal dining rooms. For example a classic 6 would have a total of 6 rooms. A living room, kitchen, master bedroom, second bedroom, maid's room and a dining room.

Duplex - An apartment with two levels or floors.

Flex 3 - A two-bedroom apartment with an alcove in the living room that is convertible to a room.

Hi-rise - Tall elevator building. Usually with a doorman and over 15 stories high.

Junior 1 - An alcove studio that was converted to a small one bedroom or a smaller then standard size one bedroom.

Junior 4 - A large one bedroom with an alcove used for dining area or converted to an additional room. Also called a flex or convertible two-bedroom apartment.

Loft - Large open space with high ceilings. Typically found in former commercial buildings that were converted to residential.

Low or Mid-rise - Are small elevator buildings. Usually 10-12 stories. Pre-war and Post-war - The architecture of buildings in New York City is categorized by whether it was built before (pre) or after (post) World War II.

Studio - The smallest standard size apartment offered. Features one main room, which is used for main living and sleeping area. The kitchen and bath are usually separate.

Triplex - An apartment with three levels or floors.

Walkup - Four to five story building with no elevator.

White Glove Building - A luxury doorman building usually with concierge. Often offers more services and elegance than a typical luxury building. The doorman's uniforms would include white gloves, hence the term "White Glove".