The mission of the Singapore Land Authority is to optimize land resources for the country's economic and social development. The lay ministry oversees the legal advice of the SLA. The monitoring includes setting property lines.
A registered practice surveyor in Singapore monitors property boundaries. SLA requires registered surveyors to handle SLA directly, including completing the survey's technical and administrative requirements.
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Every foreign national must seek approval from the Singapore government before completing a purchase. However, ownership or purchase of a real estate in Singapore is limited and only applies to those who have made a reasonable economic contribution to Singapore.
City Development Authority
URA's mission is to plan the country and make it a beautiful and sustainable place to live, which includes conservation functions (historical and cultural sites). Over the years consultation has become an integral part of its planning function, spanning the public and private sectors.
Housing Development Council (HDB)
The Housing Council is under the supervision of the Ministry of National Development. HDB is a government housing agency in Singapore. It helps to plan and deliver inexpensively, but high-quality housing.
HDB regulates the sale of HDB apartments, including their resale. HDB is also working to implement various systems so that owners can monetize their homes as long as they make sure their business doesn't affect their neighbors.
You need to understand that approximately three-quarters of all land in Singapore is owned by the state. The government uses the land to promote and plan for urban growth and to stabilize the market price of the property.