Use some of that equity and enjoy the leverage.

You have already received some very good advice, you can leverage the $100K to get more units and therefore more cashflow and more net worth growth over time. 

I am currently analyzing a potential house hack on a historic home.

The appreciation in the area is not that great (2.2%), the property is a historic property built 1890s and has been a student rental forver. 

Look into house-hacking, sub-leasing when it's legal, options like these are lower cost effective ways to get started that you can actually leverage to successfully invest long-term.Otherwise, there's no golden goose, and no get-rich quick option in real estate, same as everywhere else.I hope this helps, reach out anytime with questionsBest,Ryan

Self-directed IRAIf you are self-employed with no w-2 employees, you can set up a Solo 401k & rollover funds from a non-Roth IRA as a tax-free direct rollover and then invest in real estate.A Solo 401k has several advantages as compared to a Self-Directed IRA including the following which specifically apply to your situation:Unlike a Self-directed IRA, you can have the account for the Solo 401k at a bank or brokerage that does not charge maintenance fees and where you will have checkbook control.Unlike a Self-directed IRA, if you use leverage (which must be non-recourse financing in either case) to acquire real estate with your Solo 401k the income will not be subject to Unrelated Debt Finance Income taxGeneral Considerations Re Investing Retirement Funds in Real Estate:1.

Location and the historical nature of the building

Build your network of investors, your team of professionals, and leverage relationships.  

If the property is able to qualify for a 80% leverage.

Unless you have a background in historic building restoration I wouldn't recommend that.That being said - definitely get an inspection and try to find an inspector familiar with old buildings. 1920s buildings have different common pitfalls to check than 1950s buildings and 1990s buildings.