Hey Jeff, This is a great question and one we get all the time as we specialize in working with real estate folks, but the size of the portfolio can vary widely. 

The tax benefits of S-corporations are widely misunderstood and over-promoted.

or have you found various creative solutions to secure favorable terms?

Add outdoor security cameras (just let guests know they’re there) and maybe some motion-sensor lights for extra safety.

I have mlo in Oregon and it’s the division of consumer finance and corporate securities. ca probably has a version of thathowever I did all my loans with my ca brokers license  

That's more like a typical security deposit to rent an apartment, lol. 

What’s the best way to secure a deal, and not encounter with another wholesaler going after the same property.

Quote from @Stetson Oates: The vast majority of disputes are over security deposits and the most a landlord could lose is 3x the deposit amount.Slip-and-fall or other major lawsuits almost never happen.

With the large down payment, you’ll likely have built up enough equity to secure better terms.

ADUs can significantly enhance your property's value by adding living space that can be used for rental income or as additional living quarters for family members.The increase in value from an ADU can vary widely depending on several factors such as the size, quality, and functionality of the ADU, as well as its integration with the main property.