Reno redevelopment officials point to the ReTRAC project, which dropped downtown train tracks into a trench, as a catalyst for further improvements. Now a condo and casino developer wants to build on that promise with development of retail on top of a roofed ReTRAC. Fernando Leal, managing partner of L3 Development LLC, wants to work with the City of Reno to create a pedestrian mall where the open ReTRAC chasm gapes.The city has met with Union Pacific, which owns air rights over its track, to determine adequate ventilation in case of fire, says Kristin Rossiter, economic development manager with the …