Areas with good school districts, public transportation, and amenities tend to attract reliable tenants. 

I ask this because it does not mention anything about retirement accounts, at least as far as I have read, and if I did put money into a 401K it will take about 4-5 years to save that much with my current living expense, (the largest parts being rent, insurance, and transportation, as mentioned in the book)Thoughts on this would be great.

In boston let me know if I can help

Based on the aerial shots of the property building 2 ADUs may not be easy because of set back requirements and to be honest I know that you don't need off street parking if close to transportation and it is a garage conversion on a single family home.

Though my property is within 2 blocks of the community college, a private university (Simpson) and a school of ministry, plus adjacent to a convenience store, and public transportation. 

Too vague to figure out which property, as there's 150+, but not too squishy where you're wondering if the property is in the good area of the neighborhood, at the edge, close to transport, etc.  

Where do you suggest for a first investment (multi family) with 200k living in Boston?

I just moved to Philly from Boston, where renters have no way of bypassing a real estate broker.

As for amazon HQ2, Boston is currently leading with Atlanta, Austin and DC close behind.  

Impact fees in Montgomery county are 25,000 for schools and 13,000 for transportation, anything over about 5200 square feet is an extra 2 bucks a foot.