In several urban core submarkets, the existing base of apartment units has more than doubled in the last decade, according to data from RealPage Market Analytics. Unlike the nine downtowns that added the least amount of new supply in the last 10 years, these seven urban cores have added between 8,000 and 18,600 units during that time. Two Washington, DC submarkets make this list. Inventory in Navy Yard/Capitol South has nearly tripled in the last decade as more than 15,000 new apartment units have grown the base by nearly 200%. Northeast DC, meanwhile, added about as many units – roughly 15,000 – and grew by about 109%. Several Sun Belt supply leaders appear here as well, including Central Nashville, with incredible growth of over 18,500 units in the last decade. Charlotte’s Uptown/South End, and Houston’s Downtown/Montrose/River Oaks also more than doubled in the last 10 years. Finally, western submarkets Central Phoenix and Denver’s Downtown/Highlands/Lincoln Park area also doubled existing stock.