By their metric none of the bedrooms in my house upstairs or downstairs are rooms; My living room remains a room but the kitchen becomes suspect. Dining room would clearly be eliminated. Tough now it appears that one of the two finished bedrooms up in the livable attic now becomes a room as well.

The WALL furnaces downstairs are in the living room and a common hall by the kitchen, back bedroom, family room and back bath. The upstairs area is served by a combination window vented air conditioner and heating unit.

I think a better answer might be based on where the room is located and whether it has any exterior windows? Is it accessed only from a bedroom? Is it a mud room type of unheated area between a garage and a three hour fire door to the rest of the house?

Regardless, If it is stuck in the middle of everything else, it is living area (in my opinion). I had a 1920’s built apartment complex in an older part of Los Angeles near USC. Each one bedroom had a LARGE closet area between the hall and bathroom. Long ago I think these were simply separate ‘dressing rooms ‘ or areas in an era where even one bedroom apartments had formal dining rooms, with built in buffets and living rooms had Murphy beds.

In any case, the young couple clearly used it as the babies bedroom (about 8 x 10); other tenants used it as computer rooms, junk rooms, etc.. I identified it as ‘closet area’ but pointed out the additional utility and compared it with other apartments that had “small dens” reported. These were likely similar areas. The market seemed to treat these as better than normal one bedrooms, but less than two bedrooms. It was as much GLA as any closet would be. It was also part of the net rentable area.

Here again heat was by a wall furnace out in the living room or dining room, near the old floor register for the gravity heating system the units were designed with..