A lot shall have a green area ratio (GAR) of at least 0.3, except that:
For lots that have more than one (1) building, the GAR requirement shall be that applicable to the tallest building; unless the tallest building has a footprint less than four hundred and fifty square feet (450 sq. ft.). In such case the building with the largest footprint shall constitute the principal building for the purposes of determining the GAR requirement.
D.C. Mun. Regs. tit. 11, r. 11-J211