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.

I've worked with some Canadians buying  here in Ohio.Indeed, rather than selling your stocks to fund investments (and lose out on any potential price appreciation and dividend payments, as well as incurring capital gains taxes), a nice alternative is to borrow against some percentage of the holdings.You would start with the brokerage where you hold the stocks and see what their loan program looks like for the account you hold. 

However, these programs typically qualifies borrowers based on their income, such as tax returns.The DSCR would be a good option considering you and your husband are entrepreneurs and the tax returns don't look good on paper.

The fact that you have a TAX-FREE income is crazy good.  

That leaves $400 to cover taxes, maintenance, vacancies, etc.Now, let's pretend ALL your expenses come to $2,600 and you have $400 left over.

Yes, do the tax exchange if you can.  

We pay payroll taxes and workers comp, we comply with state and federal laws regarding work place safety, PTO, vacation, labor laws et al.

Also, managing the property as a rental could offer tax benefits.When purchasing, keep in mind condo association fees and maintenance costs.

All-In Costs & Profitability-ARV: $450K-Purchase Price (financed): $170K-Repairs: $150K-Holding Costs & Financing: ~$20K–$30K (insurance, taxes, utilities, interest, etc.)

I currently have a pre-tax retirement account with employer match and a Roth IRA invested in the stock market.