Brookline (Mass.) Contributory Retirement System hired EARNEST Partners to run an active domestic midcap core equity portfolio, said Frank Zecha, executive director. It is a new asset class for the $180 million system. The size of the portfolio hasn't been determined, although it will likely be $10 million to $15 million, according to the RFP issued in August. Funding will likely come from cash. Meketa Investment Group assisted.