участок под застройку(developable: (of land) capable of being made more profitable, by building houses or factories or by improving the existing buildings. Collins Alexander Demidov)
жёсткая конкуренция за землю под строительство(I’d agree but put more of the blame on municipal zoning than on developers in this case. When there is comparatively little land zoned for development, competition for developable land is fierce, and it makes financial sense for developers to build as tall as they possibly can to recoup the costs of outbidding other developers for that land. (Reddit)ART Vancouver)