Is it worth it to invest in a student rental when investing out of state or is it too much of a headache when you can't be physically present? 

She currently has 2 traveling nurses in the upper part of the house and the downstairs studio has a traveling physical therapist.The returning short term tenant downstairs is a consultant for the legislature.

I don't focus on warehouses but the investors I have seen that do focus on (at market or below rents & BOLT down businesses) as KEY drivers for investment.BOLT down means that the business in general has expensive and heavy equipment that is difficult to move tied down to the space physically and trying to go to another location would prove a major disruption to the business.Businesses that can pick up and move in an instant tend to have more negotiating leverage especially if the market has high saturation levels of that asset class product in the same rent range.

when we didn't see physically)... but will charge for the treatment cost.

After purchasing they may have found that they couldn't afford to do many improvements to increase the physical value and flip the property for a profit so just rented for an acceptable price. 

She is not capable of participating financially or physically.

They kept everything digital which I liked and quickly sent a courier for any physical papers.

@Nathaniel M Cooper Yes, you are correct: When the physical address is the post office, it's a PO box.

Water is the only exception I make since you have to actually go to the local water company and physically sign and pay a fee by check, no online. 

If they want to physically complete the subdivision they have several additional steps to complete...and maybe they're working towards them, but that's not what their listing says and I don't see an in process project on the City's permitting portal.