The reality is the opposite - if it's not in writing then the PMC doesn't have to provide the service or can charge extra for it!

A 4 bedroom unit would be in the $100K range.This means I'm looking for older homes in the older parts of the city.The buildings may be more rundown and need some extra maintenance but it makes it easier for me to get cashflow out of them.Your approach should always be to find deals, offer 15-20% under asking price, be prepared to negotiate, and lean on your team of experts for the heavy lifting. 

Quote from @Sean Pedeflous: Yes, I recommend charging extra for pets.

However, by doing so, I'll be paying $1000 extra each year towards my mortgage, reducing my cashflow to $4000/year.

If you show someone how  seller financing works, the extra verbiage, etc., is too much sometimes for them.

For example, if you have a 30-year mortgage and you make one extra principal payment a year, It will take roughly 7-8 years off your mortgage.

To give a little extra help to people you feel give back to the community. 

Get an extra job, live in the cheapest possible accommodations, put your head down until you have 3-5% to put down (plus some reserves) on a house hack. 

I just don't want the extra traffic, signage, or liability of actually operating a business in the residence.

In every home we contract in for our clients, we always suggest doing a flat white (we use promar200 extra white in flat finish) and we use the color pediment in eggshell also by Sherwin Williams in the PROMAR 200 product line.