Guston Lanka (Pvt) Ltd is an apparel manufacturing facility located in Tambuttegama, Sri Lanka, certified LEED Gold under LEED BD+C: New Construction v4 by the U.S. Green Building Council. Certified on 15 February 2023, the project achieved 65 LEED points and encompasses approximately 38,270 sq ft of industrial space. The certification reflects the company's commitment to sustainable building design and environmentally responsible industrial development, contributing to Sri Lanka's growing portfolio of LEED-certified apparel manufacturing facilities.