Workers from Rana Construction Co. of Newark are in the process of building a four-family residential structure at a cost estimated at $238,200, at 604-606 Frank E. Rodgers Blvd. North in Harrison on a portion of the site where a five-alarm fire on March 10 damaged adjacent buildings off Davis Ave., injuring five Jersey City firefighters, displacing 17 residents and destroying two restaurants and a church hall. Harrison Fire Official George Kondek said an investigation by the state Fire Marshal’s office, FBI and Harrison Fire Dept. concluded that the March fire started accidentally as a restaurant kitchen cooking fire. He said the flames and smoke activated a fire suppression system “but there was too much fire to contain it” and the fire “got into the vents and went from there with whatever grease had built up,” inside the walls. The owner/developer of the new structure is listed as Rain Man RE, LLC, of Kearny.