Throw out some post cards to motivated sellers- no equity maybe. 

Then either visit the owners and ask if they're interested in selling or create a postcard campaign (something simple on cardstock, but keep it personal).  

Hello BPI will start marketing 5-50 unitsI have not seen many sample letters or postcards to target Multifamily Units.

Thanks @Jonathan Towell for the comment and information you shareAs an example, when looking for a list to mail letters or postcards to apartments/multifamily one criteria to create a list is as follows 1) year built: 1940-1990, 2) 5 to 50 units, 3)sale date: 7 years or more, 4) 50-100% equityDo you have something similar when looking for storage facilities?

You can go to yellow.com for letters and postcards.

Before we finished rehabbing that deal I sent out 200 postcards to the addresses within 2 miles of our property and only got 1 call.Lo and behold on Wednesday, the phone rings and it's a person who got our postcard, been holding onto it and FINALLY decided they were going to get rid of this property...

It costs me $40 to send 100 postcards and I bought a list from the county for $50 that I will get 3 or 4 100 address lists from.

If calling back is not the best approach, I'm thinking about sending a post card with my agent's card.

I'm looking to send a letter that is professional because i'm an agent in a smaller town where I'm well known, but I also want to offer to buy their house and suggest there are other options as well.I'm not comfortable doing the typical yellow letter style mailer/postcard, I know many people get results with those but I'm uncomfortable associating my brand and myself with that style of marketing in my small town.I've read on BP many people that have simply sent a professional letter and had great results.  

I have tried Wholesaling and mailed Post Cards and have not had any Success yet.