They hurt housing supply, which can, in many cases, but not all, increase returns for investors.

@Chris Mason  could give you a definitive on this one Lenders can in fact give credit for the extra rent being counted as down payment, and here's the guideline from fanniemae.com direct. 

.- If there's water below the slab that's wicking into the concrete, the area under your new flooring will become moist, without any water ever showing itself above the new flooring - a breeding ground for mold.- If there's water below the slab with a bit of head on it (the water level wants to be above the slab), it will begin to push up on the slab, and may cause it to lift and crack.

I've found I can do as good a job as they can in most markets.

For example if the ESA is a breed that is restricted by your insurance company and having the dog would cause them to drop you and the replacement policy would be more money or impossible to secure you would have grounds for denial.

I suggest that whichever way you go, get experience and education on how to do that type of transaction the best you can, in order to limit mistakes and to get good at how to put that type of deal together. 

Negativity breeds negativity.  

Partner up with other dentists, doctors, lawyers, accountants, etc. if you can in order to purchase a larger deal. 

It is not "reasonable" to put a Pit Bull in your apartment if your insurance company is going to cancel or jack up your rates because of a "dangerous breed" animal."

We are leaning strongly into keeping our Minneapolis Rental house and finally raising our rents (while we can in Minneaplis still) to get them up to what current Market rates are and then looking to get 1 STR to start and if we can get a second at some point in the first year or two even better.