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.

@Jorge Caceres Is this with electric baseboard heaters or  heat pump/minisplits.

It was a huge investment, but it cut the electricity cost by the full 2K per/mo all summer.

did half the flip work, sold with new walls and new electric/plumbing.

The property does have heated radiators through out each unit. everything is separated for each unit electricity, gas, and window units in each property.

If there’s specific projects like electrical we get a project specific estimate after we put it under contract prior to the earnest money going hard.

Electrical next but mostly for eligibility purposes. 

Already has some electric and plumbing hooked up.  

Electric: is the easiest to split, but may require holes cut in walls to separate the units.Gas: gas lines aren't as flexible as wires, but it can usually be done affordably.Water: most cities will NOT install additional water meters on a property.

However, these properties generally have a lot of land improvements that qualify as well as certain portions of electrical, mechanical and plumbing that can qualify.