MODEL HOME NOW AVAILABLE FOR SALE! The model is now open by appointment only, contact us for info. Mason Hills is the perfect blend of the master-planned lifestyle and the convenience of a community in the middle of the action. Just off Lakeline Blvd in the Cedar Park / Leander area you'll find Mason Hills. A wide, welcoming entrance pulls you down the main road to find a private pool, parks, playgrounds, basketball court, ponds and walking trails. Tucked away in smaller enclaves are homes with architectural style and livability.