Triangular in shape, the property extends from the public fountain known as 'Chafariz do Rato', through Rua do Salitre, to former Rua Direita da Fábrica das Sedas, where the silk factory was located, and which is now known as Rua da Escola Politécnica. The property is encircled by an enclosure wall of considerable height, the function of which is to support the ground, given the differences of the ground levels between the garden and those two streets. This enclosure wall is entirely covered with limestone and is crowned with a balustrade, interrupted at intervals by plynths supporting ceramic urns. It is harmoneously integrated in the fountain, constructed two centuries earlier in the same stone. A plain wall separates the east garden from the adjoining yards. It contrasts, in its simplicity, with the rest of the enclosure wall.