What do you mean by neighbors?
If you are talking about the housing system, no API has been wrapped for housing yet, as more or less everything needed is available via Lua. (GameManager.Lua exposes the Lua interface)
Also note, that housing may not receive any mesh support, due to the "decor" options and inability to deal with highly-dynamic areas. This is something I do want resolved sooner rather than later, but there are other pressing issues first!