I have been renting it out for a few years and refinanced 3 yrs ago for lower interest rate of about 4.2% and to pay it off quicker by shortening the life of the loan.This is a single family home located in SE Aurora (outside of Denver). 4 Bdrm/3bath.

Jake, welcome to investing in SE PA. 

That said, there's a lot more going on in that area than Western MA.I focus on SE CT.

If the activities rise to the level of a trade or business and you/the entity are/is a dealer with respect to the mentioned properties, the income would not be capital gains but instead ordinary trade or business income subject to SE taxes.I'd recommend you engage a professional to help make the decision (especially if you expect first year net to be $300k), as there are qualitative and quantitative factors that need to be considered. 

Now, I don't have a problem with manufactured homes per se, the issue is I would (very obviously) own the best house in the neighborhood - the complete opposite to what I've read and accepted to be sound investing advice.

Additionally the debt had to be non-recourse since I, as a person, was not an owner, per se, of the property.

Additionally the debt had to be non-recourse since I, as a person, was not an owner, per se, of the property.

Se if you can eventually intern at a commercial firm close to you in the asset class sub niche that you have interest in such as (large multifamily, office, warehouse, retail, industrial, self storage, etc.)  

For larger deals, SE USA (FL, GA and NC) since they have lower costs and good job growth.

If you're looking to buy or sell in SE Wisconsin, Vanessa Taylor is the person you want to work with.