10 Downing Street

Just thought I would ask for some suggestions and feedback or ideas for a project I have been working on for a while. I don’t actually know much about the property etc. so if you have anything you think might be valuable information please let me know. I have posted some pics below on what I have done so far and happy to receive any feedback you have. I am aware it may cause some lag on computers simply because of the size but that’s not really what this thread is for talking about.

The floor plan is a little bit intense, yet not even half way done :/
I hope you can clearly see the three different sections and to keep it simple I have maintained the line down the middle of each three sections. I have forgotten the numbers already but I think the one on the right is 10, correct me if I’m wrong, 11 in the middle and 12 on the left. The lower half of 12 is left as a home business and the top half of 12 will be the servants quarters (I am deciding whether to have two 1 bed apartments or a 2 bedroom apartment and ideas on this would be nice). In number 11 on the lower floor will remain offices. No 10 will be the residential portion of the property extending along towards the back of the lot. I was going to keep level 2 a guest area with some bedrooms and possibly some additional communal rooms. Level 3 and 4 will be dedicated to the residing family only. I’m not sure if that will be quite enough room for the family but we’ll see how I go. So that is what I have done, I do want to keep some of the back yard somewhat empty but if you have ideas on what I can include let me know. I have already got a courtyard in the front of the property which is out of the way. I can’t think of anything else at the moment and I don’t intend to change the building structure but if you have feedback it will still be greatly appreciated. Thanks for taking the time to have a look.