For example, if I want to sell a five-unit multifamily in Washington DC, it seems these agencies will market almost exclusively to their own clients -- and thus end up on both sides of the deal (dual agency). 

Just hate to leave my clients hanging like that. 

*This post does not create an attorney-client or a CPA-client relationship. 

I’m a Realtor and have clients in Aberdeen so I’m down that way all the time.

I can do one client at a time or so but not more as a pregnant stay at home mom of two toddlers.

The difference is that there's a professional salesperson (real estate agent) hosting the appraisal who in no small part justifies real estate values for a living (to clients, to appraisers, etc etc), versus a consumer on a refi just opening the door and saying "yup come on in, I'll be in the other room if you need me."

This is not legal advice and does not create an attorney client relationship.

If I had a client with a 25 unit apartment full of long term rentals, I would encourage hiring a separate property manager. 

I've used them - as have many of my clients - here in Tampa. 

I found a client a "3% down, closing costs paid by lender" mortgage being offered to a select first time home buyers.