the apa building is a heritage-listed office building located at 53-63 martin place in the sydney central business district, in the city of sydney local government area of new south wales, australia. it was designed by david w. king and built in 1936 by kell and rigby. it now houses the lindt cafe on the ground floor, which was the scene of the 2014 sydney hostage crisis. the building was added to the new south wales state heritage register on 2 april 1999.