I'm contemplating if it would be better off in the future to have all long term units or if there's no cost difference for types of rentals. 

You will probably need a new valuation report might cost you $2,000.  

Unless you're paying cash, your monthly motgage payments are going to be so high that it will take a big hit on your Profit and ROI, right?

@Leah MillerTypically no - condo bylaws and zoning regulations typically do not allow to segment a units potential exists to possibly combine units (which can be cost prohibitive as you need board approval and potential building code issues) but I have never seen a condo building allow someone to subdivide a unit

It was $5.99/month, but it worked very well.

Normally they're set up to take a lot of your money and sell you some kind of monthly software subscription.Search google for a white paper on tax lien/deed investing in your state. 

Repair & installation costs in the Boston area are some of the highest in the country.- Watch out for residential tax exemptions, and be aware of which towns / cities have them.

It took me about 4 months for the paperwork to go through.

I sold my 8 unit and am closing the end of next month.

. - Understand the cost/value of completing an ADU project- Underwrite mid-term and short-term upside cases as well.