Those condos have always been vacant. My father has joked about the new condo development downtown for years. The fire department staffs partly based on downtown population, so they have gone door to door for years. They noticed that claimed occupancy rates are very wrong (maybe because of tax implications).
I have also noticed that many units, in complexes that have been finish for years, have paper on the windows. I don’t know if the paper was never taken off, or if “investors” are trying to protect their “investment” from the sun.