Sun, 06/02/2024 - 06:23 Tech Insider Homes in Mokošica, Croatia, where flat roofs can signal that the owners intend to build additional floors.Joshua Zitser/Business Insider Tags Real Estate, International, Croatia, Millennials, housing-crisis, real-estate, multigenerational-households, news-uk Source Croatian millennials can't afford to buy homes. The solution — build on top of …