Just speculation, but usually it goes something like this. The person wanting to hire you takes good care of their property and can't stand that the property next door/across the street is an eyesore. The property owner doesn't care and they and the person wanting it cleaned up have had words over it. So you get called to take care of it and get stuck in the middle. The guy with the unkempt property may even be keeping it that way just to irritate the neighbor. It's probably not a job you want, but my scenario could be totally off. It's not all that different from getting a call from a wife whose husband isn't taking care of their property according to her standards and decides to call someone. Both are situations that I run from.I would NOT mow a lot you do NOT have permission to mow. Your county should have a website that shows land plots and owners. If you want, find the owner, get his permission in writing and charge the homeowner that hired you. OR better yet, let the homeowner do so, but verify it also.