I decided to employ the lower land spell to craft, to great effect, a narrow snaking city high up in mountains with only a single tile width path leading up. The problem came when my serpentine city was the last one left standing, and suddenly I needed more room to expand. But alas I could not cast lower land because the city's center was too far away from my target tile. That seemed a little odd. Surely I could just walk up to the house knock on the door and ask if they would let me stand on the lawn while I flatten this mountain. But alas... no

I have 2 suggestions: Provide a mechanism to allow the city's perimeter + the range of the spell to determine my casting range while stationed inside a city.

Secondly borrow a page from Age of Wonders and have an improvement that allows for much much larger casting areas when you're stationed with it.