if you see that photo that shows these houses for miles...
you might begin to understand what Malvina was referring to.

of course they are not all exactly the same -- as the verse
says there are pink ones, and yellow ones, etc.(paraphrasing)

It was a statement of the times and I find it tells a very
good story. I can[t imagine anyone taking offense at it.

I am guessing there is not such an example of urban sprawl
in UK since most who find fault with the song are "Yookers"