Do you look to make at least $100 dollars a door after all is paid (Mortgage, Taxes, Insurance, Property Management, Repair %, Vacancy %, etc..) ?

The foundation repair was a bit complicated.

He walked into it feeling like the original lease terms were not fair because he was responsible for upkeep and repairs.

Any repairs done by property manager will be compensated at an hourly rate. 

If so, that will affect the numbers quite a bit (especially vacancy and repairs) and it could affect whether you can get a PM company to actually manage it for you. 

I have access via my partner as I am approved by his broker to be his assistant and I pay separate fees from my partner for MLS access. 

Its my first home and has done better each year , I bought it 4 years ago for 388k valued now at 615k , I'm finally at a place where I could move out and have some positive cashflow , kinda not if we are taking 5% vacancy 5% repairs , 10% cap ex and management fees, but If i solely move out and self manage it will create positive cashflow unless unforseen cap ex . 

In this situation, should the seller be responsible for the sewage pipe repair cost?

No major repairs or upgrades needed immediately.These are a sample of the properties.

You do not spend money unless it is absolutly necessary in regards to repair/maintiance and anything additional must contribute to a rental increase with a pay back of your costs ideally within two years.