Massachusetts Housing Finance Agency Retirement System, Boston, is searching for a manager to run $3 million in a diversified private equity fund of funds. The system has a $2 million investment in venture capital, but "we wanted to get into other areas of private equity, and to expand our allocation," said John Doherty, executive secretary of the $54 million fund. Funding will come from rebalancing the system's equity investments, he said. RFPs are available from Meketa Investment Group, the system's consultant. Proposals are due Sept. 16, and fund officials plan to make a selection by December.