Related to Source Grade

Investment Grade means a rating of Baa3 or better by Moody’s (or its equivalent under any successor rating categories of Moody’s); a rating of BBB- or better by S&P (or its equivalent under any successor rating categories of S&P); and the equivalent investment grade credit rating from any additional Rating Agency or Rating Agencies selected by the Company.
Highest adjacent grade means the highest natural elevation of the ground surface prior to construction next to the proposed walls of a structure.

Source Grade definition