In conducting neighborhood average calculations, the neighborhood shall consist of the three nearest lots on both sides of the subject property and three nearest lots across the street from the property having common street frontage(s) and located in the same zone. In cases where there are fewer than three lots on one or both sides of the subject property, or three lots across the street, the neighborhood average calculation shall be based on the greatest number of applicable lots up to an intervening street or street terminus. Corner lots, through lots and other lots with more than one street frontage shall provide neighborhood average calculations for each street frontage.