Detail’s April issue delves into the construction and design of buildings with balconies, terraces, loggias, and arcades. Sometimes these spaces extend the living area, as seen in Olaf Gipser’s high-rise in Amsterdam. In other cases, they create dynamic access zones, like the residential arcades by Lendarchitektur and Scheiberlammer Architekten in the centre of Teufenbach in Styria, which alternate between open and private areas. It also features Casa Costa in Barcelona, a fascinating special case. Strictly speaking, the townhouse lacks outdoor areas, but its entire courtyard facade can be opened up extensively, transforming interior spaces into airy loggias that merge inside and outside. And tucked away beneath the canopy of plane trees in Elephant Park, the Tree House in south London offers a public roof terrace enveloped in greenery, where expansive openings merge the pavilion’s rooms with the park’s natural landscape. Discover two new hotels in Switzerland and Austria in our special Interiors section. Viennese architecture studio PPAG boldly and innovatively expanded the Steirereck in the Austrian Alps, while in Pontresina, Gion Caminada’s Hotel Maistra 160 continues the Engadine building tradition.