Municipalities are required to house everyone so the situation doesn't even begin to be comparable to the US. Ballpark a shabby dorm room to yourself as the minimum, bath and kitchen might be shared, washing machine will almost invariably be. In Berlin there's about 27k living in those shelters, about 2k are sleeping rough, and that's as a metropolis smaller cities tend to have zero. None of that includes people crashing on somebody else's couch, but it does include apartment burned down and you don't want to pay for a hotel until you find something new kind of situations.

The official term is "emergency accommodations" and they're supposed to be short-term, hence also the low standards, but we haven't built enough social housing in ages and the stuff that got build constantly stops to be social housing as municipalities cheaped out and simply tacked "X% of units as social housing for 30 years" onto building permits, which leads to municipalities push come to shove having to rent hotel rooms and eat the difference.

The whole situation could be solved within a decade if we re-instituted the social housing programmes of the 50s, and you can't do it as one-off investment as construction companies aren't willing to increase their own capacity for a short-term boom.

Side note: Berlin had a referendum to expropriate all landlords who have more than 3k units, it passed, but wasn't 100% binding and politics is dragging its feet implementing it, including the social democrats. With legalities out of the way though they're now starting one that would be immediately applicable law.

The reasoning of the socdems isn't even completely wrong, "we should build instead of expropriate" but MFers don't seem to understand that people are out for blood. If the people want to expropriate something you can say your bit that you think that there's better solutions but fucking do it. Especially in the east.

And, no, the landlords won't get compensated at market rates. The whole thing is possible because for landlords housing units are means of production and Article 15, Berlin doesn't even have to show it's for the public good. Eminent domain type stuff is Article 14, 15 is way stronger and there because the constitution was deliberately written to be compatible with democratic socialism.