Purchase price: $612,500 Cash invested: $20,000 Primary residence turned into first rental.

https://www.biggerpockets.com/forums/922/topics/1175338-maxi...I personally bought my last primary residence in November 2023 with a 3.08% assumable loan (in a 7.5% rate market) and hope to buy my next few homes the same way every year! 

That way you can use that 2% to do a rate buy down to ensure a better cash flow.If you are buying it as a Primary owner occupancy I would ask for 3-4% seller credit to cover rate buy down and a portion of closing costs.

Another option is get a Stated Income Heloc on your primary residence through a good bank.PM and I'' be happy to refer you. 

 HELOC allows it be in 2nd position and it allows you to get up to 90% ltv for primary.

Can a landlord rent a primary structure and an ADU separately? 

Since the DADU is on the same property as my primary residence, can I place the DADU in an LLC, separate from my primary residence, to protect my personal assets from liability?

You will not want a policy for only a rental, you will likely need to switch companies so that your primary, autos, and rental policies are all with the same company.

Does anyone know if you can use a DSCR loan to build a DADU on you SFH primary residence property?

It is low risk because you can use a low money down primary residence loan, you are right there to deal with hiccups as you learn to manage an STR, and if it doesn't work you can just switch it to MTR or LTR pretty easily.