The developer for the Trolley Pointe project in Derby recently submitted a revised project plan for the site of the former school photography business at 90 Main St. The project originally included 70 market rate apartments in a five-story building. But co-developer Joe Salemme said increased construction costs have led to a revised plan that includes more units to offset costs. The new plans call for a six-story building with 105 apartments, according to the city’s zoning enforcement officer. It will now include 39 one-bedroom units, 62 studios and four 2-bedroom units according to the application sent to the planning and zoning commission on Nov. 11. The public will have a chance to comment on the changes at a commission meeting next month. Salemme said construction could begin in the spring if the plans receive approval.