The yellow rowhouses of Tiers 3 and 4 (4th tier having merely one more storey than 3rd tier and using a paler yellow) are based off real rowhouses in Bath, England.
Each tier modernizes a bit, with Tier 1 fitting in the late 17th century and Tier 6 fitting in the late 19th century.
Here is the .3ds file without the clocktowers and without textures. The attached image depicts the content of this latest file. I suggest making Tier 0 shorter but I couldn't find a height I liked.
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