Upgrading buildings

It would be great if we had a place (link) for buildings in upgrade (completed or not). That way, we could see when they would be done or we could set them to work without visiting the "all" link and searching all of them.

All | Resources | Raw goods processing | Livestock farming and agriculture | Factories | Shops | Other | Own categories

For ideas for how to do it, I suggest buildings get in the "upgrade" buildings when you click them to upgrade once.
Buildings would get out of it when you make them work again.