It is now vacant, but the previous tenants lived there for over a decade and had no concept of personal hygiene. 

As I might have mentioned before, I recently acquired a multi-unit rental property, and the (former) tenants living in one had no concept of personal hygiene. 

Many jobs, nurse assistant, hairdressing, dental assisting, and numerous others can be learned in a year or two in a full time school.

This strategy may generate substantially less of a profit, but it can be a quick turnaround.So these were my three exit strategies prior to finalizing the deal, then I recently got the bad news that the dental office has vacated due to retirement.

So this is my dilemma: I have no money at all right now since I'm a full-time dental student living off of student loans, so at this time I'm in no rush to start investing.

It would be like building nursing homes or dental offices.

If my receptionist is going to school PT to be a dental assistant...

Lender do offer medical and dental professional loan with lower down payment and no MI and some of the DPA programs which offer some special incentives to professionals only. 

The general location is good but access, speed of traffic, and site work make it problematic without a dental office, veterinary clinic or similar specific user.

Also, get the holes in the roof closed up and also trim all the trees that overhang the roof, that could be how the rats get up there.2- Tell your tenant that you are sorry, but it will be handled with his renter's insurance (which, if you have a good lease, it will say that he has to or should have it) FYI: outside or in the garage makes no difference here, it is HIS bike, not yours.3- Make letter (for documentation) about the poop outside and tell him that the poop is the cause of the problem, and that he has to clean that up or he will be evicted (I am sure there is a clause in your lease about maintenance and  keeping things hygienic.