The PHA is an ecologically and agriculturally vital area. It's a wetland, vital for bird and wildlife, it produces 50% of Cape Town's fresh produce http://futurecapetown.com/philippe-horticulture-area/ and is one of the few green areas and open spaces on the Cape Peninsula not yet under development. It's a heat sink and important water acquifer. Yet the DA want to concrete over it. 
Elsewhere on DM today Helen Zille, exceeding her authority by speaking on behalf of the city about the water disaster ('system crash' expected by March 2018), blames everyone - drought, public and government - but not themselves. But note Zille and De Lille championed the development of PHA http://gctca.org.za/farming-in-the-philippi-horticultural-area-the-facts/. I don't know how else to describe it but the DA and many of their senior leaders have some of the signs of schizoaffective disorder in their approach to many things, eg they consider the costly white elephant a 'strategic asset' but not the PHA.