Boston Medical Center has announced Wednesday it has received a $15 million gift that will go to BMC's facilities expansion plan. The plan includes a new ambulatory building, an expanded emergency and trauma center, and increased inpatient capacity through developing a new building or tower. The expansion project will be a multi-year capital expansion project that will create approximately 500,000 square feet of new clinical space to consolidate services, upgrade and expand service, and improve access to care, said BMC representatives.