It’s important to consider where the properties are located and where the Series LLC will be doing business.The primary advantage of using a Series LLC is the ease and efficiency with which you can create individual "series" (or "cells") within the master LLC, each functioning as a separate entity without the need to file separate LLCs with the state.

For Short-Term Rentals (STRs), you can combine your spouse’s hours to meet the material participation requirementHowever, if you own both STRs and Long-Term Rentals (LTRs), be careful:    Material participation hours cannot be combined across different types of activities.     

It is our intention to combine our equity and purchase a quadruplex or similar.

Your interest in combining real estate with photography, aviation, or finance is smart and there are definitely creative ways to tie those together.

Especially when combined with a cost seg and bonus depreciation strategy.

You can lend money to people (that you know and trust) who are actively operating in the real estate space or work with companies like Groundfloor or Fundrise to invest in real estate backed notes.Since it is always a good idea to diversify, I like the idea of combining your first option with the strategy I just mentioned.

Three, they function more like the accounting systems I'm used to from my corporate days--you can't delete things as easily, so there's a clearer audit trail.

That said, a few portfolio lenders, credit unions, or community banks in the local market might be more flexible, especially if you can show consistent income from the land contracts.Another option: bundle 2–3 of your performing notes and refi with a blanket DSCR loan, if the combined value meets the lender's minimum.Also worth connecting with private lenders open to low-balance long-term rentals—they’re usually more flexible on loan size and structure.Would you be open to creative financing or JV structures on future deals?

Limited land availability combined with strong demand does play a big role in driving prices up in the Northeast.

Quote from @Andrew Steffens: Love this - this combined with rate cuts will turn economy into a rocket.I am pretty bearish on rate cutes.