Abu Dhabi Future Energy Company (Masdar) has extended the closing date for commercial bids to build its headquarters at the zero-carbon Masdar City development in Abu Dhabi until 6 September.

The original closing date of 23 August was set when technical bids were submitted in July.

Masdar has shortlisted four companies for the tender: the UAE’s Al-Habtoor Engineering Enterprises with South Africa’s Murray & Roberts Contractors (Middle East); US-based Contrack International; Germany’s Ed Zueblin; and Japan’s Taisei Corporation.

The architect is Chicago-based Adrian Smith & Gordon Gill Architecture. Louis Berger Group is the project manager.