As the community grows in population, it behooves people to establish businesses to serve their various needs. This creates prosperity for all those business owners and employees who provide services to maintain and improve their homes, provide them with groceries and entertainment and restaurants and pharmacies. The provision of good transit increases the land value close to its stations; the provision of a highway to higher paying jobs increases the land value close to its exits.

The provision of good emergency services and hospitals and libraries and other amenities raises the land values within their service areas. (They don't raise the value of the buildings.)