Thanks Colan. Very helpful article as well. The conundrum is this. Since you're in Toronto, I can use the actual city names.
The business address is in Burlington. They sometimes show in Oakville's 3pack as well as Milton's 3pack. The leads coming in from Milton have been extremely bad, costing a lot (in sales person's time on phone), etc. They are fine with ranking in Burlington and Oakville, but would prefer not to rank in Milton.