PORTLAND — As three of the city’s iconic restaurants, Brian Boru, Lolita and Silly’s, announced their impending closures this month, several others are working to open, expand or relocate, making for a busy time in the city’s food scene.

After more than 30 years, including more than 20 at 40 Washington Ave., Silly’s closed Sept. 1. Brian Boru Public House, a fixture on Center Street for more than 25 years, closed Aug. 26, and Lolita, a Mediterranean restaurant on Munjoy Hill, was shuttered on Sept. 2 after five years in business.

While Brian Boru’s, Lolita and Silly’s have wound down their operations, several restaurants are gearing up in new ways.