Are there cons to building a new modular 4-plex vs buying an older more run-down one that I am not considering?

I started with some youtube videos, as well as reading BiggerPockets Ultimate Beginners Guide.

I didn't do any due diligence as I had no intention of buying, but assuming title and physical condition were decent it looked like an easy $50-100k flip.

The next one is more pricy but we plan on staying in it 7 to 10 years until we buy our dream land to build. 

Did you buy with the intention of doing STR?

Would love to help if you're looking to buy here! 

If you want to scale up and buy more faster putting less down is the best plan.

We have been contemplating our strategy to start our business by having my sister buy her first home locally here in Connecticut, a duplex as her primary residence and live in one unit with our mother, while renting out the other unit to a resident, and be able to also rent out her single-family house as a short term/midterm rental to traveling nursers/working professionals on furnish finder.

Quote from @Hunter Gibson: Hi everyone, I am looking to learn more about Pre-Foreclosure/ Foreclosure homes and how to buy them. 

Finding lenders and mortgage brokers that specialize in DSCR loans will help with getting better terms as they have investors comfortably buying these loans after the loans fund which helps replenish the lenders cash for more loans to investors.