Is there a garage that could be converted into an ADU or used as additional rental space to neighbors and is the driveway functionally obsolete for more than 1 tenant? 

Once you have a short list, get an account with each one and run them through the wringer to see how they really function.

Its basically a function of the complexity/risk of the engagement and the general skill level of the practitioner.

Redfin has a solid search function to view sfh with guest houses if you click that option. 

I guess I don't know how to make the @xxxxx function work yet.

You're new to being licensed, but it sounds like you don't plan to function as a traditional agent.

If you have a clean and functional property and priced it right, you will find the right tenant.

I used to ask similar question like this before but after quite sometimes I found the car should be divided by its own functionality, so one family is good to have:1. one luxury sedan2. one SUV/4WD for snow travelling3. one truck4. one cheap sedan for commuting  or for each kid.5. one minivan to carry all my bikesI don't know I always lucky to find $5-6k nissan altima in good condition, 120k miles and never go to garage shop. 

If those pumps are functional, you shouldn't have any concerns around flooding.

And since your COC return is largely a function of exceeding your fixed costs - especially your PITI - most of these dollars left on the table would have been essentially pure profit.