A rendering of the proposed 37-unit residential property at 101-103 Morse St. The proposed conversion of a historic building into a 37-unit apartment complex took a step toward final approval Wednesday night by gaining the support of the Planning Board. The property at 101-103 Morse Street used to be the Cortiva Massage School, but has not been used in several years. A previous owner tried twice unsuccessfully to get approval for a residential conversion — first with 46 units and then with 36. Mouhab Rizkallah of Lacourt Affordable Trust LLC presented the new plan, which he said has some significant differences from the previous ones.