In fact, multifamily construction is now at a 40-year high; the trouble is, developers are putting up the wrong kinds of buildings. The luxury market is largely overbuilt…..Apartment completions in the 150 largest U.S. cities jumped to 395,775 units in 2017, beating 2016 production by a staggering 46 percent and more than doubling the long-term average, according to RealPage, an apartment management software and data company. Luxury, upscale buildings accounted for between 75 and 80 percent of the new supply in the current cycle.