PITTSFIELD — It's showtime at newly christened Power House Lofts on Seymour Street, the former Holy Family Church.

Curious officials and former church participants came Thursday for an open house, the culmination of a year of renovation. There are 10 apartments in the building, and they're already sold out, said developer David Carver — a point Carver and his team said speaks to the demand for housing in the city.

"A lot of people had committed to the spaces before they had fully taken shape," said Craig Barnum of CT Management Group.

New tenants are moving in next month, Barnum said.

The building at 133 Seymour St. was built at the turn of the 20th century as a powerhouse for the city's trolley system, then the Roman Catholic Diocese of Springfield remade it into a place of worship.

This summer, Carver is scheduled to break ground on his largest church renovation to date, a 29-unit apartment complex called Morningstar at the former St. Mary the Morning Star Church on Tyler Street.

Morningstar, which officials believe will transform the Tyler Street neighborhood, will be the fourth Berkshire church to become housing at Carver's hand. His firm also redeveloped St. Raphael's Catholic Church in Williamstown into the eight-unit Church Corners Apartments, and later converted the old Holy Family property in North Adams.

Bill Sturgeon and his wife, Rose Ann Marcinczyk Sturgeon, toured the repurposed church, making a point to visit the former altar where they were married in 1971.

"What they have done is absolutely unbelievable," Sturgeon said, looking around.

Too often, he said, city buildings like this one are knocked down. Marcinczyk Sturgeon said Holy Family was her childhood parish, and she later taught CCD classes in the building.

"I spent a lot of time here," she said, smiling. "This really brings back a lot of memories."

Amanda Drane can be contacted at adrane@berkshireeagle.com, @amandadrane on Twitter and 413-496-6296.