Demolition

You can research the Demolition skill at the bottom of the City research tree.

It allows you to remove buildings you do not want anymore.

This is useful especially for :

• Cottages (these are good early on but provide little population later on)
• Storehouse which adds little to the later Warehouse

Note that it takes several steps to demolish a level 15 Storehouse while Cottages are always level 1 so they disappear a few minutes after you clicked on "Demolish".