Northeastern University’s Dukakis Center has said the state needs to double or triple its rate of housing construction in order to meet coming demand. The Patrick administration believes the state needs 10,000 new apartments and condominiums per year over the next decade just to have a housing market that functions normally. Massachusetts has only hit that level of home construction a few times over the past two decades. Boston Mayor Tom Menino recently outlined a plan to add 30,000 new housing units to Boston by 2020; as big as that number sounds, it still means that 70 percent of the state’s new homes will have to come from somewhere outside Boston. Much of the remainder will have to come from places like Lowell, Quincy, and Malden.