Walnut Creek is a suburban city undergoing an urban make-over, and condo development 555YVR is yet another sign of the change.  With its sleek, modern look and short distance from public transportation, the 87-unit project is proving that high-density living can work in cities dominated by single-family homes. The building offers features such as a gym, floor-to-ceiling windows, high-end finishes and appliances, nine- to ten-foot ceilings plus the “sky lounge,” a rooftop terrace with an outdoor kitchen, fireplace and views of Mt. Diablo. The city’s chic shopping district has a regional draw with Broadway Plaza, a Nordstrom and Macy’s-anchored outdoor shopping mall, which welcomed the East Bay’s first  Neiman Marcus department store in 2012.