I would do an average size home for about $300.If this is for a municipality, it will need to be a to-scale, flat 2D drawing for their filing purposes that includes every room - down to each closet.

Some PMs charge a full month's rent, others charge a flat fee. 

Everybody thinks they understand real estate, after all its just walls and a roof?  

So I’m in a bit of a bind, I have a duplex I’m house hacking we remodeled entire thing, new hvac, electric panels, electric main, updated plumbing, water heaters, furnace, install central air, roof.

a lot of new investors run rosy numbers, see that they'll get $250 a month in "cash flow," and then they have to replace a furnace (in a single family) or a huge roof (in a multifamily) and that "cash flow" is gone for years. 

Have the opportunity to purchase 64 homes, all have renters, book of business is very profitable. 90% of the properties have new roofs.

My strength admittedly is on the administrative tasks.For those who are opposite of me, who struggle with the administrative side, would you consider a B2B relationship with a service that takes all of the tasks off of your hands, and if so what would you be willing to pay (% or flat fee).To be clear, what would be offered would be:- Listing on 15+ channels including Marriott Homes and Villas, Abnb, VRBO/, Booking.com, Zillow, coming soon Amex Travel and Hyatt, Jetblue and Allegiant Airlines, and more.- Pricing software w/ live revenue manager- Smart Lock software- 24/7 Guest Communication via platform, voice, text, email.- 24/7 Communication with owner or PM staff for maintenance or cleaning issues. 

Roof, HVAC and foundation all have no issues.My plan with a property like this would be to get positive equity asap and re-fi.

Will you be required to inject capital if they need it to repair roofs / foundations / plumbing / etc. 

You want every single nook and cranny of the basement, as much of the roof line as can be seen, the entire property lines and grounds, the road in front and neighboring 8 houses.