Even if they pay late sometimes, you have a late fee to compensate you.

Do they charge any fees in addition to their asking price for properties?

Time the Sale Strategically: Selling the property in a year when your income is lower can place you in a lower capital gains tax bracket, reducing the tax rate on your gains.8.Deduct Selling Expenses: Costs associated with selling the property, such as real estate commissions, legal fees, and advertising expenses, can be deducted from your sales price, thereby reducing your taxable gain.9. 

Tenant B has the option to enjoy W/D for a set, flat monthly fee.

Turn over cost when your tenants leave (check leases), marketing cost to add to the placement and monthly fees from PM, and utilities if those are provided by the landlord.What's your exit strategy?

So, the first question they usually ask a PMC is about fees - instead of asking about services and HOW those services are executed.EXAMPLE: PMC states they will handle tenant screening – what does that specifically mean?

An advisor, not affiliated with any investment house, who works on a flat fee basis would be a step in the right direction. 

I currently only have 1 duplex, however I want to set this up right so it will work for any size portfolio.Currently I haveHome folder>multi family/single family/legal documentsInside the multi family I have Name of property-> general property maintenance/first floor/second floor Inside of first floor (the one currently rented)I have, pictures (before and will have after) / lease documents / a spreadsheet with each month, what day rent was paid, if it was late, if late was fee paid?

@Gisell Garcia I've used apartments.com, which is currently free and ERentpayment.com, which charges $3/house or $10 flat fee.

What's a reasonable fee?