If you're open to expanding your options, you may want to check the Columbus OH market. 

@Cole Starin sometimes it makes sense to sell the WORST property in your portfolio.Another option is why do a LOC on the duplex, when you could just do a $100k cashout refi to pay off all your debt AND keep the property?

Being a NYC resident (originally from Long Island), the price of entry in the area is on the higher end, so I've been considering some options in the NY Capitol region, as well as NJ and CT.

But I would remain open to long-term rental as an option as this seems like a more stable option in terms of income, again this may be my inexperience talking.However, I have always  been somewhat risk averse and investing in real estate is always a big venture, in my opinion/experience, in terms of capital.

If you're still in college and working with an FHA loan, a duplex can be a solid option.

Quote from @Jimmy Chao: I am weighing some options to help my younger brother buying his first primary with a fixer.

I'm looking to identify a builder with the following characteristics:1) Eager to grow his/her company and reputation in the market2) Has produced at least five high quality builds in Arizona which are at least 4K sq ft  3) Has proven track record of completing builds in a timely manner4) Personal capital to allocate to projects (optional, but ideal)Please reach out to me if you or someone you know might fit these criteria.

@Max Bellino For smaller properties like your 2–4 unit multifamily buildings, an online cost segregation study is a quicker and more cost-effective option, providing sufficient accuracy for straightforward properties.

Homewrite is seems like it could be a good option.

It's possible to buy property in Germany with as little as 5-10% down, making it an attractive option for service members and civilian government employees stationed there or planning to settle.