There are more than 3,600 new apartments under construction or planned for downtown Phoenix, according to a new report. Real estate firm ABI Multifamily says there are 1,260 apartment units currently under construction in downtown Phoenix and another 2,343 in the planning and proposal pipelines. ABI’s Thomas Brophy said there are more than 3,800 existing units in downtown Phoenix across 63 properties. Brophy said there are another half dozen under construction.