The Horsham Land Reuse Authority has asked a consulting firm to scale back the number of housing units proposed for the closed Willow Grove Naval Air Station. The firm had recommended just under 2,000 units in developments of single-family homes, townhouses, condos and apartments. The local authority wants it cut back to a little more than 1,400 units. The plans also call for a mixed-use town center, similar in many ways to Valley Square, just a couple of miles up Route 611 in Warrington. Reuse Board Chairman and Township Councilman William Whiteside says the smaller number of units and larger lot sizes will give local officials and developers more flexibility as the time to start building approaches.