PROVIDENCE — A tenant in a Mount Pleasant duplex that caught fire yesterday morning was treated for smoke inhalation at Rhode Island Hospital, the Fire Department said.

The tenant, a man in his late 50s whose identity was not released, escaped on his own from his second-floor apartment at 188 Leah St., said fire Battalion Chief James Mirza.

Heavy smoke was visible when firefighters arrived around 8:30a.m.The fire was in the living room, according to Mirza, and it took about 20 minutes to bring under control.

There was moderate fire damage, and throughout the two-story wood-frame house there was extensive smoke and water damage, leaving the dwelling uninhabitable. Tenants on the first floor were not home at the time of the blaze, Mirza said.

The cause of the fire is under investigation.