Living in old age defines new housing requirements. Opposing characteristics are in demand. Resting places are sought after, the own four walls allowing glimpses to the outside but not imposing them. They should be bright, allowing the changing seasons to penetrate indoors. The contact with the outside world must be direct. Spaces for relationships are sought after, airy spaces between the private. Spaces where one sits together, reads, cooks, and helps each other. Spaces for grandchildren, who visit regularly. Spaces for good conversation. Living must be temperate. Sunlight, as the giver of life, is an essential part of spatial design and therefore of architecture itself. Concrete material offers manifold possibilities to give living spaces temperature control. Insulated concretes retain heat in the house, normal concretes store energy in the structure, recycled concrete fillings can serve as external energy storage. Thin, high-performance concrete panels serve as room enclosures and absorption surfaces. The apartments are designed to allow sunlight to pass through, oriented towards the sun. The ideally south-facing facade features rotating elements made of high-performance concrete or glass. When closed, the facade forms a buffer space, achieving a U-value of 0.42 W/(m2K). At an outside temperature of -10°C, a buffer room temperature of approximately +15°C is reached. The sunlight striking the facade is directed into the interior through the transparent elements, where it is converted into heat and made usable. The light striking the opaque facade elements is absorbed on the surface and partly directed to the buffer room. On sunny days, at an outside temperature of -10°C, a buffer room temperature of more than +21°C is achieved.