If the lots have already been created, then they are part of a final map (subdivision). The builder will be required to build as outlined on the recorded final map. Additionally, 4S would have an approved Master Plan that lays out all development within the Master Plan area.

For a builder to build something other than a single family home on any of those lots that originally called for single family would be a lot of work; Master Plan amendment, new final map, public hearings, etc.

I’d say that you can be pretty sure that any empty lot next to an existing home will be built (eventually) as originally called for.