Some of Nassim Road's mansions sit empty because their owners bought them as investments. Katie Warren/Insider Nassim Road, Singapore's most prestigious street, is lined with embassies and mansions. I walked down the street recently and found many of the residences empty in a state of disrepair. Most of the mansions were barely visible behind dense foliage and gates with security cameras. See more stories on Insider's business page. Nassim Road, a quiet, tree-lined street that's less than a mile long, is the most exclusive and expensive street in Singapore. Nassim Road is located near the Botanic Gardens in central Singapore. Google Maps Nassim Road's ultrawealthy residents live in mansions known as "good class bungalows" — the most coveted type of housing in Singapore, which must have a land area of at least 15,000 square feet."Nassim has become a brand name on its own," Bruce Lye, the cofounder and managing partner at Singapore Realtors Inc., told me.