The range for full service is 15-25%.Also as mentioned above you ought to be licensed and properly insured if you are to be a property manager. 

I like the mechanics garage one could also take massive cost seg on all that equipment.. and same could be done with doctors office.. i did that with a dermatologist a few years back and it has worked out great helped young doc walk right into a functioning practice without her having to go borrow hundreds of thousands to outfit a shell..

If you have a clean, properly marketed unit you can get an approved section 8 tenant within 7-10 days.

One thing a lot of people get mixed up with is capital investment and equity.. if you don't explain this properly the investor may think you are scamming him.

Use the lookup function.

Each require a lot of upfront due diligence to make sure you are making the proper investment. 

Professional pictures, MLS, good rehab, properly priced, buyers agent and buyers agent commission is what will sell your property.

This will show if they properly planned for charging the tenant.

Take ownership of your mistake and learn to do the proper due diligence recommended above😊

Ok, now we are back to taking advantage, because buyer is NOT capitalized properly, and banks won't lend to them because of RISK of non-performance.