Dutch firm Powerhouse Company has unveiled plans for a high-rise apartment block in Rotterdam, which could become “the slimmest residential tower of Europe”. The skyscraper named Baan Tower is set to reach 150 metres high with a compact footprint of just 20 by 20 metres. Designed for a site near Rotterdam’s Erasmus Bridge, the 47-storey-tall tower will be faced in dark grey stone and feature aluminium window frames. Its 21,000-square-metre plan will house 145 apartments with an extra two duplex penthouses occupying the top two levels.