With his assistance, the department headed WOW Philippines Intramuros, a multi-agency initiative for revitalizing Manila's historic district, which became one of the most visited tourist spots in the country.

In September 2005, then Philippine President Gloria Macapagal Arroyo appointed Arreza as the Administrator and Chief Executive Officer of the Government-Owned & Controlled Corporation.

[4] On his first year as SBMA Administrator and CEO, the Subic Bay Freeport Zone (SBFZ) successfully served as the venue of four (4) events of the 23rd South East Asia Games - namely archery, triathlon, canoe/kayak and sailing.

The following year, the Freeport topped the list of Philippine investment promotion agencies (IPAs) and was declared as a major component of the Metro Luzon Beltway, a super-region that was envisioned to become a globally competitive urban, industrial, and service center.

He spent the rest of his term at the Subic Bay Metropolitan Authority, firming up the Freeport’s position in the region's containerized transport industry and as one of the country’s tourism, sports, and MICE (Meetings, Incentives, Conventions and Exhibits) destinations.

The institution is primarily dedicated to providing basic education and facilitating access to knowledge and learning based on Christian values to the less fortunate sectors of the society.