The Mark Twain Village is a housing development built in 1948 in Heidelberg Südstadt formerly used by the American forces. It extends on both sides of Römerstraße and is intended to contribute in future as regeneration and redevelopment to the social mix of the district.

Alongside the restoration of existing buildings, new buildings are being constructed here with a total of 114,000 square metres of residential and commercial space and 1,300 residential units.

In the northern area Cyrus Moser Architects is building two new-build developments on an area with five new complexes. All the buildings are detached, mixed typology in different heights and in part staggered floors. Cyrus Moser Architects is building 76 rental and 28 owner-occupied apartments with a total of 7,844 square metres of living space. Instead of being enclosed as previously, from an urban development viewpoint the houses now arranged more openly and loosely in a block-type structure. The result is a flowing transition from the adjoining existing property. The houses are surrounded by small, individual and slightly raised residential courtyards. Clear lines, light façades and angular but pure shapes give the buildings reserved, elegant aesthetics. Variety and plasticity is provided by the projecting balconies, loggias and windows arranged irregularly over the floors and in different sizes. Skilfully developed floor outlines enable floor-through apartments and the large areas of glass provide openness. On the courtyard side, the balcony elements are designed over two floors and are thus both protection from overlooking and roofing. In the façade areas of natural stone or varying colour nuances give small touches to the entrances and around the loggias. On the ground floors small businesses are moving in, which is shown by recessed entrances and shop areas and by metal surfaces in warm bronze shades. The building corners on Römerstraße are shop windows cut in diagonally.

The two complexes are scheduled for completion in 2021.