Your best bet is to find one that has flexible membership options, without high spend requirements.

We are looking for lenders that understand the market (we are in Lousiana and are casting a wide net due to flexibility) and that will fund our first deal(s).

If your landlord wants more rooms painted, I would tell him to hire a contractor and I pay 3200.You can roll two rooms in an afternoon and in the end it's only $100 and at least you have someone who seems somewhat flexible.

When you are on the commercial side of the bank, and borrowing on the bank's balance sheet, they have a lot more flexibility to how they handle loans.  

This gives you flexibility to reassess if Inglewood's STR regulations change in the future.

If the owner financing terms are flexible, what would make this potential purchase more favorable on my end?

Be flexible to your tenant's needs, but do not make the mistake of buying their BS. 

The HML/PMLs generally have more "flexible" or "creative" lending terms (higher LTARVs and longer amort), but the trade off is higher interest rates.

Private money lending bridges the gap between speed and flexibility for investors while offering lenders a secure way to grow their returns.

Others tap into personal savings or use business lines of credit for more flexibility.