Hi Rob, this is bob, the old boat owner!

Is it a specific neighborhood/area (geographic market) or it is a specific list of home owners within an area(s)?  

I wondered why the City of South Bend would hire an out of town company for the study until I looked at their national client list which includes over 450 reports for builders, developers, cities, non-profits, planners, investors, lenders, small companies and development subsidiaries of several Fortune 100 companies.You can read the report here https://www.southbendin.gov/sites/default/files/fi...The report is mainly about the residential market potential of downtown South Bend but the gist of it as it relates to your question is that on page 5 it states that approximately 60% of the households in the entire City of South Bend are owner occupied and 40% are tenant occupied.The US Census Bureau data confirms this with their latest data showing appx 59% owner occupants and 41% tenant occupied here:  https://www.census.gov/quickfacts/table/PST045215/...

Others will know better than I but I'd consider avoiding the property manager at first - They are expensive and rarely do a better job that a caring/motivated owner.  

I have designed and built several dozen projects from New Construction to whole-house remodels to deep energy retrofits to additions and kitchen and bath remodels.I'm the Owner/President of Boston Architects and Builders, Inc.

I tried to find the owners using the counties CAD but nothing is showing up.

The existing tenant will be kicked out using OMI (Owner Move In), assuming the tenant is not protected.  

You have renters and not owners surrounding your investment. 

A couple of ideas we've been brainstorming:Postcards shaped differently, maybe in the shape of a houseBig text offering to make a $1 donation to charity for calling our number just to let us know who their current management company isHandwritten lettersPlease share any innovative ideas you may have to grab owner's attention for mailers or ways that have been successful for you in the past. 

After a months work to raise the rent, change the Home Owners Insurance company, get an Appraisal and maybe pay down a little on the mortgage to remove the Mortgage Insurance, I should be able to show up to $300 a month Net Rent.