Short for 一居室 (yījūshì, 'one-bedroom unit'). Real-estate listings standardize as: 一居 (1BR), 两居 (2BR), 三居 (3BR), 四居 (4BR). You'll also see X室Y厅 (X bedrooms, Y living rooms), e.g. 两室一厅 = 2 bedrooms + 1 living room.
culture
Apartment size in Chinese listings is given in square meters (平米 / 平方米). A typical 一居 in a first-tier city is 40-60 平米. Pair with 户型 (hùxíng, floor plan) and 朝向 (cháoxiàng, facing direction).
