My local jurisdiction imposes an owner occupancy requirement on JADU's but not ADU's, even in the case of an internal ADU that could be a JADU due to overlapping definitions.ADU's are exempt from rent control and thus fixed term rental contracts are possible. 

@Lillian Burke big and overlapping problems, with no silver bullets, but if you want an approach to changing the situation I think you have to start with zoning codes.

Or are you expecting them to give their 30 days notice, but still pay you for the overlapping 2 weeks?

In my area I schedule 3-4 showings from noon to 1pm and don't mind if they overlap since it creates a sense of scarcity and urgency.My last rental I had 2 applicants fighting over it since they saw it at almost the same time.

We prefer the interlocking ultra instead of the overlapping self-stick type of Allure.

Sometimes you can convince them to pay overlapping rents for a couple weeks, but don't expect good tenants to be ready to move in tomorrow, is my point.  

If he doesn't care, then just fence a area on your side that overlaps the gate by 1 foot on each side.  

I'm sure there is some overlap, but most likely very minimal. 

You're absolutely right Deanna, overlaps between property descriptions happen all to frequently, often as a result of different surveyors using different reference points when doing the field work on neighboring properties. 

Pro-rate the rents for both units with minimal, if any, overlap, depending on how much personal property needs to be moved, and time tenant needs for cleaning.