Abstract: Abstract The paper presents the features of TPSI (Tall-building Projects Sustainability Indicator) – a ‘Sustainable Rating System’ that specializes for tall building projects. The system was developed by Binh K. Nguyen and Hasim Altan at the University of Sheffield, UK in 2010. It can be used as a ‘design tool’ of a ‘checklist’ to compare and to improve the sustainable performance of tall-building design schemes and at the same time can be used to evaluate the sustainability of existing tall building projects.