Da Vaal Estates. Val Powelson, A.I.A. Mid-century co-op unit in the Tamarisk Country Club area of Rancho Mirage. Designed by Val Powelson and built by Robert Marx, son of Gummo Marx. The complex consists of 20 units, is sited on over 2.5 acres and surrounds a large swimming pool and spa looking over to the mountains. The unit has two master suites (two bedrooms and two baths). The dramatic angular open plan design, together with the large expanses of glass and soaring ceilings, creates light and airy interior spaces. The complex is listed on the Rancho Mirage Register of Historic Resources