A key vote Thursday has cleared the path for construction of a major hotel and residential development on the Fort Trumbull peninsula. The Planning and Zoning Commission approved a site development plan and a special permit for Optimus Construction Management to build two four-story buildings — a 100-unit apartment complex and 100-unit extended stay hotel. The land is owned and marketed by the city’s development arm, the Renaissance City Development Association, which has been working with Optimus for the past several years. Fred Mielke, president of Massachusetts-based Optimus Senior Living, the company behind the proposal, said after Thursday’s meeting that his intention is to close on the property by the end of the month. A timeline for the start of construction has not yet been determined. Optimus specializes in senior living facilities and built a $17 million, 115-unit senior housing complex in Bozrah called Elmbrook Village. The Fort Trumbull development, however, will not be restricted to seniors.