Hi @Anthony Vu, I am from you great state of California and do DSCR loans. As @Stephanie P. pointed out, ARM just means Adjustable Rate Mortgage and DSCR stands for Debt Service Coverage Ratio. And DSCR loans can be...
ARMs - where usually the first seven years of the loan is on a fixed interest rate and then it will adjust
30 Year Fixed - The gold standard for all loans
30 Year Interest Only - The first ten years are interest only and then the rate locks in and the next 20 years become principal + interest
40 year Interest Only - The first ten years are interest only and then the rate locks in and the next 30 years become principal + interest
The gist of DSCR loans is that you are using the cash flow of the property to qualify for the loan rather than your finances. Which is part of what makes them so attractive to real estate investors (the other part being that they offer long term financing solutions when it used to be so much harder to get get long term financing on rental property). And of course, you can cash out your property up to 75% LTV.
Obtaining these loans takes running credit, proving rent roll/cash flow (or using market rents for the coverage ratio instead), and an appraisal (sometimes two) proving the value. Those are the big items needed.
If you want to talk more about it feel free to DM me.