There have been a few posts about foreign ownership of land and dual citizenship, so I’ve searched the Internet and found this mentioned on a few sites (e.g. Filipino consulates in America). I think this info refers to Republic Act No. 9225 "Citizenship Retention and Re-acquisition Act" 2003, which gives Filipino born citizens with a foreign citizenship a way to get back their Filipino citizenship. Without reacquiring their Filipino citizenship, as former Filipino citizens they are limited to owning a max of 1,000 sq metres of land.
The only way a foreigner can get Filipino citizenship is under Commonwealth Act 473 "Revised Naturalization Law" 1939. Among other things there are residency (5 years if married to a Filipino) and language (must be able to speak & write English or Spanish and a principal Filipino language) requirements. You must also renounce all other citizenships.
This counts me out, as I don't speak/write any Filipino language & will not renounce my British citizenship.
Andy
Surrey, UK