Lichtstrasse is a minimalist house located in Basel, Switzerland, designed by HHF Architects. A new staircase and an elevator have been introduced in the courtyard to create a direct access to the old houses and the old staircases were demolished in order to gain floor area. The new measures raise the desirability of the old houses and the ability to keep and lease the existing houses in the future. In the interior the new building is connected to one of the existing ones to allow spacious apartments orientated to all four sides.