When providing a referral to a valued client, never do this:

[Patrick Britton]

Recently, I asked a "vendor" with whom I've had a professional relationship for 4 years for a referral to a real estate agent, because the previous two I had were idiots.  He gave me a brand-new rookie, fresh out of licensing with a background in COSMOTOLOGY.  This idiot was dumber than the previous two.  Long story short, Roofstock saved the day.  

If you are a realtor, property manager, whatever, it doesn't matter...don't refer your "valued" clients lousy, incompetent people.  It's one of the easiest ways to lose business permanently.