The national insurance company said Friday that it was asking judicial investigators to look into a Feb. 21 fire in Tibás.
The blaze heavily damaged five storefronts just five days after one of the renters renewed a fire insurance policy, said the company, the Instituto Nacional de Seguros.
Investigators from the Cuerpo de Bomberos said the blaze was set, said the insurance company in a release.
The insurance company said that fire fighters reported that of 46 fires investigated this year, nine were set intentionally.
The Instituto Nacional de Seguros said that four 2013 fires already are in the hands of judicial agents.