Legal career Abalos was admitted to the roll of attorneys of the
Supreme Court in 1958 and then into the
Integrated Bar of the Philippines in 1973. He began his career as a fiscal before being appointed as a judge and later elected as President of the Judges Association of the Philippines.
Political career In 1963, Abalos ran for vice mayor of
Mandaluyong, which was then a municipality of
Rizal, and lost to
Nacionalista candidate Renato Lopez, the son of the late mayor Isaac Lopez. He ran for Mandaluyong mayor in 1980, losing to the candidate of former President
Ferdinand Marcos. In 1986, shortly after Marcos was ousted through a popular uprising, President
Corazon Aquino appointed him as Officer-in-Charge (OIC) of the then municipality of Mandaluyong. As OIC of the town, he ran for the post of mayor and won in the local elections of 1988, the first local elections under the 1987 Constitution. He was re-elected two times in the elections of 1992 and 1995, making him one of the two Aquino OIC appointees who survived and secured the constitution-mandated three consecutive terms limit for local officials. Abalos made Mandaluyong's cityhood in 1994, also witnessing economic growth brought about by the establishment of new shopping malls and Marketplace, the country's first build-operate-and-transfer and build-transfer (BOT-BT) project. He also initiated Land for the Landless and Home for the Homeless Program housing projects, Metro Manila's first Office for Disabled People, and Mandaluyong Collegiate Scholarship in 1996, as well as seeing the construction of Mandaluyong City Medical Center (the city's first tertiary hospital) and the Mandaluyong Manpower and Technical-Vocational Training Center.
Return as Mayor of Mandaluyong Abalos ran for mayor of Mandaluyong in
2022 under
PDP-Laban, with his daughter-in-law, incumbent mayor
Menchie Abalos, as his running mate for vice mayor. He said that he would run to fulfill his promise to his deceased wife that he would spend his remaining years serving the people of Mandaluyong. He won the elections in a landslide victory, securing a comeback as mayor after 24 years. However, he chose not to seek reelection in 2025. == Controversies==