1. Postdoctoral Fellow, Dept. of Building and Real Estate, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong 999077, China.
2. Research Assistant Professor, Dept. of Building and Real Estate, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong 999077, China.
3. Professor, School of Management Science and Real Estate, Chongqing Univ., No. 83 Shabei St., Shapingba District, Chongqing 400045, China (corresponding author).