Casa Tolo is designed with the purpose of using as a vacation house for the architects wife, children, and cousins, the Casa Tolo is located on one of the steep hill northern Portugal. Normally, architects use to fight with natural environment, however Siza did in contrast. He embraced it and uses the slope as the buildings main feature. This unique home created by Siza begins at the top of the hill, and slowly show off its beauty as you go down the outdoor staircase. Despite of being the son of a well-known and award winning person, the house has a tight budget of $150,000, no so expensive for an eco friendly building.