1. Department of Building Surveying, Faculty of Built Environment, University of Malaya, Kuala Lumpur 50603, Malaysia
2. Faculty of Engineering and Built Environment, SEGi University, Kota Damansara, Petaling Jaya, Selangor 47810, Malaysia
3. Sustainable Deliverable, 140 N Wilson Ave, Pasadena, CA 91106, USA
4. Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia