If so what percentage of the monthly rents should go towards it?

@Chris MasonIn my understanding you described two(2) extremes of Market Conditions in terms of percentage of financing compared to purchase prices.1) The "FHA Market" - or Low Down Payment Market?

The management fee, regardless of the percentage, is a big deal.  

Maryland law dictates that an agent can only be paid either a percentage of the sale, or a flat fee when a property settles for the listing of a property.

Too many variables that can cause problems (e.g., damage, warranty) and is poor business (when was the last time you brought your own beef to a restaurant for the chef to cook?).  

My experience has been there are two types of private investor deals:1) Debt - the private investor loans you $32k at a fixed (or variable) interest rate for a specific period of time.  

Extended replacement is a percentage of the replacement cost (i.e.10%).You might want to also ask about coverage for personal property.

The trustee of the trust needs to setup a budget, have a proper reserve for things like operations, maintenance, taxes/tax return, and other expenses and then disperse the remaining funds by percentage ownership.I would recommend speaking to whoever setup the trust if possible and/or a CPA to get full clarity on your issues.

I also recommend asking what they charge per clean and adding a small percentage on top.

Once the message is right and you are hitting profitable percentages then expansion might make sense.