Prime residential properties in San Francisco are outperforming those in New York on pricing, according to Savills. : Prime properties—broadly defined as the top 5% of residences in a market -- in areas like San Francisco, Shenzhen and Berlin have outperformed cities such as New York, Singapore and Paris over the past five years, according to data compiled by real estate services firm Savills. High-end abodes in Shenzhen, one of China’s technology centers, led the gains with a 93% price rise in the five years ended in December.