Could you guys make grain silos destructable? Having rampant population growth to the point that it is a foregone conclusions you'll have to abandon a city, reconquer it, and exterminate it sure is annoying at times. Being able to build up grain silos to help rapidly grow a city and then cut back on that source of population growth later would be nice. It would seem more realistic than demolishing your aqueducts.

On the same note it would be nice to be able to reduce farms in the same fashion.