Bulldozed residence

I understand building them from scratch again. I dozed like 8 (had 2 in my available to build) and still only have 2. So I cannot get back to where I was.

If you doze a factory, you have the option to build a new one to replace.

Unless they've changed something with a recent update, the residential menu building on the left will always show a maximum of 3 new buildings to upgrade at one time regardless of how many you bulldoze. Once you start upgrading the new buildings you should get the option to start building more. Have you fully upgraded to skyscraper level the two buildings currently in development in your game?

Ah! Ok good to know! Thanks- I didn't realize it worked that way- it's not a "so many per level" thing.