It seems obvious that the ongoing historic shift to multifamily dwelling spaces will be greatly accelerated by automated building practices and reduction in construction costs.I know this is out-of-the-box thinking, but you asked for some of that, and any buy-and-hold investor has to at least try to think about the future in terms of decades of steady development and disruptive change.

.- The HOA fees are not fixed and could rise in the future- Condos can be difficult to finance, particularly non-owner-occupied ones- More potential for neighbors who dislike STR activity or can be disrupted by STR guestsThere are certain places where condos may make sense, but in general, I'd recommend looking at other options

Facebook is surely still popular, but it's also popular for being a network for stolen or given away information so when you step on there and start contacting homeowners it's meta disruption.

Having economies of scale allows you to take a loss here and there without complete disruption to your cash flow. 

@Grant Schroeder If he is not disrupting your quiet enjoyment and/or the smell is not making its way into your apartment than I probably wouldn't even bring it up.

When you have a tenant that is disrupting and delays process then that creates other issues.

The tenant has been simply disruptive in the sale process.Frankly....

But I had cancer and the amount of time spent at the doctor, oncologist, surgeon, radiologists offices was very disruptive.

Otherwise I’d have to hand over a spare overhead garage door opener, and they’d have unsupervised access to my Personal belongings I have in there, like tools in my workbench, and could cause potential noise disruption to my tenants upstairs. 

It would also depend on the location of the property and how weather might ruin a roof faster or not.Personally, I would pay a little extra if I knew I didn't have to spend $20K and the disruption in 5 years on a property with a 10 year old roof.