The Department of Buildings says the complaint will be filed Wednesday against LG Properties and its president, Phillip Pappas; and Restoration Specialists LLC.
Buildings Commissioner Norma Reyes says building code requirements were not followed when the building was rehabbed in 1998.
The complaint also will allege that the defendants illegally converted the three-story apartment building from five units to three units.
Officials plan to ask for a court order requiring immediate replacement of the porch and could seek up to 500 dollars a day for each violation.
The third-floor porch fell during a party early Sunday morning.