However, in the advent of World War II, the family fortune was wiped out and at the young age of ten, de los Reyes, along with his brothers, had to fend for themselves.
He worked irregular hours, carried baggage and cargo, and slept on a cardboard mat on the floor of the office for years, at the old airport in Paranaque.
This recognition of his hard work and persistence, led to the company granting him favorable hours, allowing him to take evening classes to finish college.
After graduating magna cum laude in Management and Finance, de los Reyes headed the Sales and Architectural/Building Division of Reynolds Aluminum.
De los Reyes' real estate and construction achievements include the Pacific Plaza high-rise building in Ayala Avenue in Makati, and dozens of edifices, as well as the Gateway Business and Industrial Park.
A main beneficiary of his philanthropy has been the Geronimo B. de los Reyes Foundation, Inc., which promotes education by providing scholarships for poor children.
The Geronimo Berenguer de los Reyes Jr. Museum, located at the Gateway Business Park in General Trias, showcases the Philippine heritage.