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.

I’m Chris Dickerson, a newly licensed Mortgage Broker based in PA, specializing in financing solutions tailored for real estate investors.

The technology and AI are tailored specifically for real estate professionals who are looking to acquire properties or attract investors.

Or should I use a service such as Zenbusiness or Tailor Brands? 

You can request tailored lists based on your specific criteria.- Public Records and Local Government Websites: Check your town or county’s property tax assessor or planning department websites.

I was also considering broadening my search to North Jersey, but I am unsure if I will need to change my contracts and tailor them to each set of state laws.

You can also visit some local investor groups to see what their experiences are like for finding tenants as their advice will be more tailored to your market.

@Neal Daftary there are some great comments here and I would have to agree with @Gregory Schwartz the best rule of thumb is to keep it simple and tailor it to your investment strategy.

Baselane was built by real estate investors for real estate investors so it's really tailored to this particular business.

The TransUnion "ResidentScore" is similar to a traditional credit score but is tailored specifically for rental screening.