Short for
联排别墅 (liánpái biéshù, 'townhouse villa'). Three tiers of low-rise housing in Chinese real estate:
独栋别墅 (dúdòng, detached/single-family villa) >
双拼别墅 (shuāngpīn, semi-detached) >
联排 (townhouse, sharing two walls) >
叠拼 (diépīn, stacked townhouse, two units stacked vertically).