What is the minimum size for a habitable room per the 2015 IRC?

“The IRC sets minimum requirements for a healthy interior living environment, including provisions for room size, ceiling height, light, ventilation, and heating. The code has long provided a minimum room area of 120 square feet for at least one habitable room with all other habitable rooms having a floor area not less than 70 square feet. Most modern homes have rooms that exceed those dimensions, but the intent has been to at least provide a small 12-foot by 10-foot living room with one or more bedrooms measuring approximately 7 feet by 10 feet. The requirement for one habitable room with a minimum floor area of 120 square feet has been removed from the code.”

http://media.iccsafe.org/news/eNews/2014v11n20/2015_irc_sigchanges_p46-7.pdf

From the 2015 IRC

SECTION R304 MINIMUM ROOM AREAS

R304.1 Minimum area.

Habitable rooms shall have a floor area of not less than 70 square feet (6.5 m2).

Exception: Kitchens.

R304.2 Minimum dimensions.

Habitable rooms shall be not less than 7 feet (2134 mm) in any horizontal dimension.

Exception: Kitchens.

R304.3 Height effect on room area.

Portions of a room with a sloping ceiling measuring less than 5 feet (1524 mm) or a furred ceiling measuring less than 7 feet (2134 mm) from the finished floor

to the finished ceiling shall not be considered as contributing to the minimum required habitable area for that room.