Inner areas of building blocks in Borgerhout are often filled with warehouses and small factories. AG VESPA demolishes an existing rowhouse with warehouse to replace by two semidetached houses. A unique passage under the adjacent building enables other ways for unlocking both houses and garden. We employ two important shifts: a shuffle in property structure and a shift in day an night zones. The first house is situated on the groundfloor and on level 2 and is directly linked with street and garden. The second house (level1 &3) is provided with two roof terraces, by shaping the building enveloppe. A compact wrapped double staircase starts halfway the passage and results in free façades and a flexible and legible plan The double house becomes microcosm, city within the city.