As the United State's population has grown and demand for energy continues to increase it has become more important than ever before to monitor and regulate our energy consumption. Many measures have been taken at the federal, state, and even local levels to increase the sustainability of our metropolitan centers, but few policies compare to the recently enacted California law AB 1103. The bill was passed by California in 2007 and is now in effect as of January 1st, 2014. If you work in real estate chances are you've heard of AB-1103. California's Assembly Bill (AB) 1103 affects building owners who are looking to lease, finance, re-finance, or sell their entire building. AB 1103 included buildings that are 10,000 square feet and over when it was first enacted, but a stipulation increases the law's purview to include those 5,000 square feet and over on July 1st, 2016. AB 1103 is an Energy Benchmarking and Disclosure law and requires building sellers to report on their building's energy use trends using the ENERGY STAR Portfolio Manager system. ENERGY STAR works by taking into account a building's type, square footage, gas use, and electricity use to rank users in a percentile-based 1 to 100 point system. It should be noted for those familiar with ENERGY STAR that you are in compliance with AB 1103 even if your score is under the 75 points required for ENERGY STAR award certification. Completion of the Data Verification Checklist DVC is mandatory to AB 1103 compliance. Once a building's profile is correctly entered and utility data has been logged in Portfolio Manager the DVC must be emailed to the California Energy Commission. The law is designed to prompt building owners into taking an active role in monitoring their energy use. AB 1103 legislation creates more awareness of the ENERGY STAR program for commercial buildings and brings more commercial buildings into the ENERGY STAR fold. The following building types are required to disclose their building energy data: