The Bukharian Jews in central Queens have for years endured criticism for building large, opulent homes where smaller ones once stood, and have even been accused of ruining the aesthetic and historic character of neighborhoods.

They have weathered that disapproval with proud forbearance and forged ahead with their construction projects, arguing they have done nothing illegal and that their big families demand big homes.

In recent weeks, however, the Bukharian building boom has come under a new, more violent attack.

Four Bukharian building sites in Forest Hills have been burned to the ground in mysterious blazes, and the police say they believe a single arsonist is responsible.

The most recent attack occurred early Sunday on 69th Road in the Cord Meyer section of the neighborhood, where many Bukharians have settled and where some of their most luxurious houses have appeared. The fire was set at 12:18 a.m., the police said, reducing a construction site to ashes.