Before I built the big Windle Castle, I started with a smaller "castle" for the Garrison, which I have kept in my Windle version of Riverview. Its small and includes the Military Post, the Police Watch Post as well as a gym, and a dining hall on second floor. There is also a poolpond in the yard.
It can be used as a community lot, or if you prefer, change it to a residence and use it for housing.
First floor:
Floor 2:
Placed on 2 Bridge Parkway in my Windle version of Riverview.