The TDC sale dedicates a perpetual conservation easement over the sender's land prohibiting future subdivision or changes to the site. The improvements give tenants control of air conditioning and lighting through their touch-tone phones. Larger after-hour tenants can activate only the zones they need. These and other technical changes cut energy consumption and operating costs in half. Its compatibility and permeability give glass technical advantages over gravel especially for drainage systems, base course, and backfill applications.
Designers can use recycled glass, or cullet, aesthetically for pathway and driveway surfaces.
One design uses clear glass pavers with subsurface lighting to frame a walkway. Prairie Crossing and Tyron Farm respond to existing vegetation and the natural drainage features of the land, and site buildings in response to the sun. They also promote ecologically-sensitive lifestyles by encouraging compact living and less car use. The RSF system can also allow construction on land not suitable for septic tanks. The National Association of Home Builders Research Center installed RSF systems at three houses where soil conditions would not permit use of septic tanks.