Your house look was okay numberplay but I think it was not completly there with that sandstone roof
I have a few quick simple suggestions that you can take to use in anyway you want. They may help save space when building the lower class ad upper class area of the city.
What we could do is have most of the houses either attached or semi-attached to each other in the same street to help save in building cost and speed up the construction process.
We could also have a quick suggestion posting set up for this topic, so some creative people can suggest a few styles for the houses that can be used for some upper class houses and some streets for the lower class area of the city.
I also do agree a 10 spare area is quite small but if it is used right by making it a two story house with a ladder and a basement when its prebuilt I think itmay be big enough for a lower class house to rent.
We could also half the amount of lower class homes and make some bigger attached, semi-attached or stand alone houses for people to rent that dont earn enough money in a week to rent a big house in the capitol but do not want one of the smaller lower class houses. We could call them middle class houses. (this seems a bit like the system of the the teir class there has been in medival europe and during the industrial revolution by what I am suggesting here
)
The fourth thing I am suggesting is that if you dont like what I suggest is to ignore it and carry on like I didn't mention this at all because I am not sure if I even like some of these suggestions.