If they're responsive and know how to save you $ on taxes sometimes the premium price pays for itself.   

Thank you all for great responses.

@Jason Seay  We have in our lease that all parties are responsible for the total rent. 

Here's a revised response with a more structured format:---Hey JeffIt sounds like you’ve got a solid deal in the works, but I totally understand your concerns about the 5-year seller carry.

I did a quick google search yesterday trying to find one in my area and got a lot of corporate type responses eg fill out this form and check the website etc.

Thank you for the informative responses!

As its a metes and bounds area, the best quote I’ve received to have it surveyed myself is $4K.

:Based on the responses you probably can see that ADU additions on single family homes are still the wild west right now, so you need to be clear on the numbers and goals in your specific market.

@amirkhan Thank you for your prompt response!

Thanks for your response.