>and we use the subdivision roads as easement to our property.
I'm sure this will come into play as well. Is the subdivision a "private" subdivision, as in an HOA? Or is it publicly-owned roads that are maintained by the local government, i.e., city, county, etc.?
The terms of the easement that you have may also restrict your usage of those roads for access, as in, to *you*, not any tenants that you may "acquire".
You also don't say how it came to be that your property is somewhat "landlocked" within this subdivision. If you currently use the subdivision roads for access, how did you gain access before the subdivision was built?