I've owned and managed multi-family properties since 1978. I've been very fortunate to have mostly good tenants, who obviously made this long journey more pleasant than not.
One of the tenants has been renting from me since 1984. He moved in on a one year lease then and never moved out. Not one day of vacancy in nearly 30 YEARS!
Another tenant has rented from me for almost 15 years and another tenant, who I just sold a house to, had rented an apartment from me for 22 years.
There's the old rental axiom that says that single family house tenants stay longer than apartment tenants. From my experience that is not always true.
One time I bought a building with an existing 9 year tenant. He worked nearby, but had a house that he owned about 100 miles away. He typically went home every weekend and only lived in the apartment from Monday to Thursday every week. Plus some times he traveled with his job and sometimes he was off work for holidays or vacation, which also did NOT spend at his apartment that I rented to him. He may have actually used the apartment maybe half of the days in the year. I owned that building for a number of years and he continued to rent that same apartment. I figured that he would rent that apartment until he retired from his job and moved back full time to his home 100 miles away. There are many employers in the area that have good paying white collar type office jobs that attract people from more rural areas, where there are not many high paying jobs. Therefore there is market niche of other prospective tenants out there looking for what essential is a part time crash pad near their employment. These types of tenants cause less wear and tear on the apartments, have good paying jobs and can afford the rent. And they save the owner from re-painting and other vacancy expenses.
At another property, I placed an ad in the newspaper about a place for rent. The first morning that the ad was in the paper, I got several phone calls. I told the people calling that the place was vacant, and if they wanted to see it to just go over there and let themselves into the property and then call me back if they were interested. One person called and said that he would look at the place on his lunch hour that day. Several other people called also and I told them the same thing, go show it to yourself, then call me.
Before noon, two people called back said they looked at the place and wanted to rent it. I told them to come by where I was and bring cash and I would rent the place. They did and I did. So they moved in and stayed for 17 years. In that 17 years I maybe talked with them 6 times and never saw them again. They paid their rent every month and the only reason they moved is that I sold the property and the new buyer wanted to move in. So saw them once, they stayed 17 years and I never saw them again.
At a single family house in an acclaimed school district, I had bought a house to rent. The first tenants who lived there stayed for 13 years until both their kids graduated from high school, even though the father had to drive 75 miles one way to work every day, just so his kids could go to this good public school.
If you have a good product, good value and in a good school district and a good crime area, it probably doesn't make any difference whether you have single family investment properties or multi-family properties.