Wellington's khrushchevka

A government built mass housing project, an architectural design without merit,  without a single redeeming feature that I can see. Socialist architecture at its worst. 

Actually it is perhaps grimer than khrushchevki, for which there was an excuse - they were built because of the devastation  wrought by WW2 and the resulting housing shortages which lasted for decades.

This was, I put it to you, was an instant slum.

Anyway its residents have to move - it is now held to be unsafe to live in though structurally sound.