Our project, a 200,000 sqft CS office tower (much more to the 20% of the total area) shares 3 levels of underground parking lot with two other buildings (Movie theater, shops, restaurants). All buildings are physically and administrative detached, but all of them over the underground parking lot. All buildings have independent administration and utilities, including water and energy metering. We are planning to use for our energy efficiency calculations only the number of parking spaces that correspond to the office tower, and we will ensure that signage is clear about the certification scope, but it's impossible to place physical or administrative divisions in the common underground parking lot. How could we be sure that we have a valid LEED project boundary?