Knock on the door if occupied. 

If you don't have marketing money to allocate to find leads, I would suggest doing a LOT of networking with people who can feed you multiple leads, cold calling (free, only time involved), bird dogging and following up on vacant or distressed properties, and even door knocking.

I have been having trouble finding them myself by doing the old fashioned door knocking and cold calling.Victorian Village in particular if you have anything please let me know. 

Bryan, I have watched you over the years, yes we had head knockings but what I've seen is you growing into your professional career and you're coming along very well.

Assuming this person is not knocking on heaven's door in the immediate future, there are better scenarios that protect this person's equity.....for THEIR own benefit.  

I would... instead of saving the addresses and mailing to them, google the names and addresses and see if you can find contact info, knock on doors and leave notes when no one answers.  

Set up ground rules regarding when it is/is not ok to knock on your door for maintenance issues.

(I accept rent the same way, so I'm not knocking you for it -- just pointing out that it's one of the drawbacks to this method.)One thing I've heard of other landlords doing, is to setup separate accounts for each property. 

Keep in mind drawings and plans have to be submitted in their entirety to the city and permits approved and paid for before I can even knock the house down.

If you have the funds but no time, you could knock it out of the park flipping houses with a good partner who has the experience but lacking the funds!