. >> this is berlin's kreuzberg district -- lively, cosmopolitan, in the center of the city. it's especially popular with young people. it's also changing. for instance number 83 wrangelstrasse was recently bought by an investor. but none of the tenants know what his plans are. carlos martinez, originally from the united states, lives here with his wife and children. their 75 square meter flat has two rooms, a kitchen, and a bathroom. they pay less than 10 euros per square meter, heat included. that's now cheap for berlin. the family is happy here. carlos: we know the people in the neighborhood, we have seen their children grow up. and now we have our own children. and we just would like to stay here. >> w will the new owner renovae the bubuildi, raise the rerent, and put the individual apartments up for sale? that's a common strategy. the courtyard has become a meeting place. everyone here is worried. will they be forced to leave their neighborhood, like so many others in berlin? the building's previous owner, who passed away in 2016, didn't want the building to be sold. but