In addition to the replacement of removed trees above described, the applicant shall replace at a location of his or her choice on the property, any trees located within the footprint of the proposed structure, plus six (6') feet, if said trees have a trunk at least three (3") inches in diameter measured at a point four and one-half (4.5') feet above the ground on the downhill side of such tree. For every tree removed within the footprint of the existing or proposed structure, plus six (6') feet, the applicant shall plant one tree along the side yard and rear yard which tree shall be of the same size as the replacement tree above described. However, the applicant shall not be required to plant trees closer than ten (10') feet between the two, said distances measured from center trunk to center trunk. The replacement trees need not be of the same species as the trees removed, however, they shall be of the same height classifications as the trees removed. There may be circumstances in which these general guidelines for replacement are unworkable due to unique conditions affecting land. The Shade Tree Commission may determine the appropriate replacement obligation balancing the purposes of tree protection stated in the preamble to this section and with the general guidelines for replacement, which may include contribution to a tree bank, which are funds dedicated to tree replacement and maintenance initiatives throughout the Borough.