Huh, sorry for your tenant. That would suck, and would make me want to stop running completely. If it hurts that much, I simply won't do it.
Expensive shoes won't cure any running problems. Learning how to run with proper form can help many such problems, but not all, of course.
Calf pain is an odd one. I hear about it the most when someone first tries running barefoot, or in Vibram fivefingers, and does too much too soon. You have to run a bit more on your toes when you run barefoot (although you eventually end up running on the midfoot when you get the hang of it). And when you do that and aren't used to it, your calves hurt a lot, sometimes for days.
But I doubt your tenant is trying this switch to minimalist running, if he is also thinking of spending $125 on a pair of running shoes.
Something that might help a lot is a foam roller, they are sold at most exercise equipment stores in the U.S (but not here in Brazil, unfortunately). Rolling works wonders for dealing with calf pain, in my experience.
I think most who try running and give up would do a lot better with long walks. If you live on the East Side, you probably saw former East High teacher Mark Brand walking all over town this last summer. He is over 60, and does at least 50 miles of walking every week. He was able to do close to that mileage even when he was still teaching at East--during lunch in the winter he would do laps around the 1st floor of East. He can still run a bit, but not 50 miles a week, so he walks it instead.