Exterior of boutique office building Twitter’s New York offices are housed at 245 W. 17th St.

NEW YORK CITY—Columbia Property Trust (CXP) has added two Midtown South properties, including the New York City offices of Twitter, to its holdings here. The REIT said Wednesday afternoon that it had acquired 245-249 W. 17th St. and 218 W. 18th St. from New York REIT (NYRT) for $514 million.