Grosvenor Crescent, Belgravia (right), just part of the high-density suburb of Belgravia (left and below) that was just one largely knocked up across London by rapacious developer Thomas Cubitt in the days before zoning was invented. Cubitt might almost be said to have invented the high-density London suburb damn him. People hate them*, and pay enormous amounts of money to avoid having to live in them.
Isn't it amazing just what developers were allowed to get away with in the days before those nice planners began to rein them in, thank goodness!
*This, by the way, is irony, just in case you wondered.