LL & Co. architecture + interiors is a multi-disciplinary architecture and interior design firm based in New York City. 

After graduating with a bachelor degree in architecture, the company principal, Llewellyn Cheng honed tremendous design and project management skills and knowledge while working for various leading architectural and interior design companies in the United States for over fifteen years before establishing his design company in 2013. He had also worked with New York real estate residential developers, and was deeply involved in project design, development and marketing for residential developments.

His project experiences include numerous boutique hotels and resorts, restaurants and retails, luxury residential development, and single family homes and apartments throughout the United States and some in overseas. His latest projects include several apartment renovations, recreational and amenity spaces for a luxury apartment complex, and a model apartment for a luxury condominium development in New York.