BOSTON — Boston Capital has closed Boston Capital Tax Credit Fund XXXI, one of the company’s nationally diversified housing portfolios. Fund XXXI includes 30 affordable apartment properties in 12 states. The portfolio comprises 12 senior housing properties and 18 family housing properties. The total equity invested in the fund is $120 million. The properties in Fund XXXI will add 2,109 apartment units to Boston Capital’s holdings, which now total more than 170,000 units. In 2009, Boston Capital also expects to launch and close two multi-investor national funds totaling between $200 million and $250 million.