The most frequent I hear are:1.

They do have pest control companies that I use in one unit where the tenant just complains frequently - townhouse sharing a wall with another owner so I have no control of next-door unit -- so I now pay for quarterly service and as part of it, they come out and re-treat for free  any time tenant has issues between quarterly treatment, so the tenant calls them now, not me.  

However, you will also be remodeling/updating a B unit more frequently than a C unit. 

My current job allows me to frequent travel which means there are many potential areas to invest in.

While not as effective as a face to face I've gotten go leads doing this when I'm in areas where they don't meet frequently or I'm there between meetings.You can also look for realtors who are selling the type of property you're interested in buying, go to their personal website and see if they are selling a number of investment homes or if that was just a one and off.

A hundred years ago, most homesteads were quarter sections (160 acres) but frequently only a portion of that (perhaps 80 - 100 acres) was available for planting (the rest being consumed by ditches, sloughs, bluffs/shelter belts, farmyard and pasture).  

And frequently the tenants don't even know the property is up for sale.Once you have an accepted contract you should be able to walk through all of the units in addition to the property inspections you will want to do.

You will notice that there are certain members frequently respond to posts that have these keywords.

I see MF deals frequently here in Detroit that list "quit claim deed only, no financing".

Get a low cost monthly-pay CRM like LionDesk to put the contacts you make on a drip and hit them frequently.