I had the brilliant idea of making a smooth transition from indoor to outdoor living at the townhouse project. The result was some costly details to execute this work as having a patio slab poured higher than the foundation wall means only one thing. Pouring a 10 ft tall wall to support the edge of the patio and hard to form perimeter walls as well. All of this likely added 50% to the foundation bill but is a win from many other perspectives. Among the positives is we can use the patios for safe access and also supporting the second floor cantilever. Will the patio last 100 years? We will find out slowly.