As far as a flat rate, I would talk to companies offering services as mine and ask. 

We have a property management company and real estate brokerage. 

Keep in mind if you are renting a house to a company you can write whatever you want into the lease. 

Quote from @Marlena Hawkins: Does anyone know what insurance (liability, E&O etc.) is required for Property Management companies in DC and Maryland? 

I imagine there is not much of a relationship with the turnkey service after the sale and I would deal with the PM and Loan company directly. 

Built a 20 person company around our own portfolio.

@Andy Ptak when jumping into the industry you have a few choices:1) Start at the bottom2) Leverage your experience to convince someone to give you a chance3) Decide between:--- Big companies who will usually start you at the bottom--- Small companies that will more like to a chance on hiring you for an above entry level position.

- Do you disclose the company name on your msg template? 

The SMARTEST thing I did...was follow a "who" not a brand or company or model or some "thing". 

Just google all the property management companies in your area.