I have some experience, having knocked down a drive through location and replaced it with a national food service company in a nice town and then also purchasing a historic bank building and leasing it out as office space. 

Or you can go knock on the door and leave a note if they're not home.

If you're just knocking down walls then you'd likely be ok without it.

If they give me a recommendation, they are the ones standing up and defending my stance if the tax man come-a-knocking.

door knocking?

Also getting contractors in place to knock out the rehab. 

So I would go driving for dollars and hanging up bandit signs, I even did some door knocking on pre-foreclosures for them.

If you want true off market deals, your going to have to do some direct mailing or door knocking.

As a Realtor, I pay almost nothing in fees to my brokerage compared to everyone else I have talked with, but my brokerage is not a big brand, I don't have a built in-assistant/transaction coordinator, there is no training program except the school of Hard Knocks, and most of my marketing I have created myself.

One of the most productive ways that we have gotten deals is door knocking a list.