Have you experienced any improvements in Inspira's service and response times? 

That said, if you can afford it and have the reserves, and more importantly think you have a decent chance of increasing revenue with the vacant units then I'd probably go for it.

I have two options 6.625% 30 year or 6.15% 15 yearI want to invest aggressively in the near future on more propertiesThe loan is only $110k and the monthly payment for 15 year is $563 and $750I will earn 2-3k a month in gross rental revenueThe property is in a declining population areaRecently rennovated, and all major things were relatively recently improved such as plumbing, the roof, a/c, electric, etc.Will require a lot of management as it is rent by the room so I may switch to a normal rental after 10 yearsI'm trying to find what will mathematically net me the most money in the long run.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

We also have a huge budget allowance from the city over the next few years to improve public transportation measures within the city.

On another note, I had a lengthy conversation with VRBO last night while we both looked at one of my listings and came up some ways to improve it. 

Do you have cash reserves for capital expenses and improvements? 

Appraiser will check the rent schedule and if there were any improvements done.4.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

If you're in Northern MN, there is a very good chance that the cost to build a new duplex exceeds the resale value, which would be an awful idea to build a new one.