Almost six years after the Menkiti family bought its first downtown Worcester property, residents will soon be moving into a new housing site in an old YWCA the family's development firm has renovated. The new development, called Chatham Lofts, brings 24 apartments to a six-story building off Main Street a short walk from the Hanover Theatre, a part of downtown just south of City Hall city officials have prioritized for new development and investment. Chatham Lofts is roughly two-third complete, with plans for an opening to residents around April. Pre-leasing marketing has begun in the past few weeks. The Menkiti Group, a Washington, D.C., property developer, bought the Chatham Street site in April 2015, spending $800,000 on a deal that didn't make big news at the time. Four years ago, Ifeanyi Menkiti, a Wellesley College professor, bought the former Shack's men's clothing store building at Main and Mechanic streets. The idea then was for a cultural center to complement his art endeavors in Cambridge, including the Grolier Poetry Book Shop in Harvard Square, which he bought in 2006.