House with Chimaeras
Due to the steep slope on which the building is situated, it had to be specially designed out of concrete to fit into its foundations correctly. From the front, the building appears to have only three floors. However, from the rear, all of its six floors can be seen. One part of the building's foundation was made of concrete piles, and the other as a continuous foundation. Usually, these two approaches do not mix well but Horodecki somehow succeeded in overcoming this technical problem.
Washington Block
The isolated pier technique uses several separate foundations, one at each of the load-bearing points underground. Thus, instead of using a single foundation that would crack as the building shifted on sandy soil, a building may be built on a much longer-lasting and sturdier foundation. The Washington Block's foundation enabled it to be built on soft, compressible soil, instead of the solid bedrock formerly seen as a requirement. This ability allowed skyscrapers to be built in places like Chicago, and many of them were.