Start researching real estate markets with strong rental demand.

It sounds like you've done a lot to improve the property already, and with a good location near a growing downtown, it has strong rental potential.

Use this experience to work out the kinks and build a strong boots on the ground team.

Out of the 20 letters I've sent, I've had 1 guy get back to me and we were in discussions but weren't able to find a price that worked for the both of us.The issue is that I only have a few houses on my mailing list so far (just places I've walked or driven by that caught my attention), and blindly searching every street and address # to see which houses are actually legal multifamily will take forever and doesn't seem efficient.I know the data is publicly available, I just don't know how to aggregate it in a way that would be efficient and useful for blasting out marketing mailers.Are there any websites that can pull massive lists of all multifamily houses in my area?

With your income and plan to pay off student debt, you’re in a strong position.

Given your experience and strong financials, you have some solid options:Commercial or Portfolio Loan: These are tailored for investors and can help you avoid personal guarantees, especially since you have an LLC.BRRRR Loan (Buy, Rehab, Rent, Refinance, Repeat): Some lenders offer BRRRR-specific loans with funding for purchase and rehab, allowing you to refinance based on the new ARV once stabilized.HELOC or Cash-Out Refi on Current Rentals: Tap into the equity on your single-family rentals to secure funding for the 4-plex purchase and rehab without high origination fees.Each has pros depending on your cash flow goals and timeline.

@Jerry Zhang, Gino's suggestion is a strong one.Why guess? 

I have been investing in real estate in my local market for 10+ years (flips, private lending, rentals). I am currently in the process of selling my portfolio of 13 rental units spread across four properties. In CT, n...

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This approach allows them to add value, increase equity, and create rentals that can generate strong returns.If you're thinking about commercial real estate, there’s definitely a learning curve, but the long-term stability and potential for diversification are huge pluses.