Site Plan - Garden Design

We have a land of 5,550 sqm, and we need to design three buildings (Villa, Guest Room and Summer Rest Room) and a garden with swimming pool. We need a professional garden design with car parking. An initial autocad site plan is available, this plan is just to show the locations of the building and the swimming pool. Levels of the land also can be provided. The land is not straight, the design will contain a steps or levels. Initial autocad file attached.