The Manila Central Post Office, often called the Post Office Building, is the main postal office of Manila, which also serves as the home of the Philippine Postal Corporation. It also houses the main mail sorting-distribution operations of the Philippines. It is located along the riverbanks in Lawton, Ermita and lies at the northern end of Liwasang Bonifacio. Its location along the frontage of the Pasig River was a part of the Burnham Plan of Manila for easy water transportation of mail. Its central location with converging avenues made the building readily accessible from all sides. The structure's main entrance faces the Liwasang Bonifacio.
The original building was designed by Juan M. Arellano and Tomás Mapúa in neoclassical style. The construction of the building began on 1926 under the supervision of the engineering firm Pedro Siochi and Company. However, it was severely damaged in World War II during the Battle of Manila and was subsequently rebuilt in 1946 while retaining most of its original design.
Information from:
en.wikipedia.org/wiki/Manila_Central_Post_Office 