开发商在郊区过度建造住宅，导致大量房屋空置。

Developers ___overbuilt residential properties in the suburbs, leaving many houses empty.

开发商在这个住宅项目中过度建设了太多豪华设施，导致成本飙升。

The developers ___overbuilt this residential project with too many luxury amenities, causing costs to skyrocket.