In the end, if you do the math right and you are putting it on top, it would be better than losing time and potential money to interest payments if you have a loan. 

This includes collecting rent, handling maintenance requests, and addressing any issues that arise.Financial Benefits: Renting out the basement can help offset your mortgage payments and other expenses associated with homeownership.

Figure out $900k loan and interest payments per month. 

The purchase price is $410K.Should I go for 15%, 20% or 25% down payment, taking the current high interest rate situation into consideration?

Basically a certain amount of equity in the property is allowed to be accessed over a period of time as long as they live in the property, with NO mortgage payment. 

I’d focus on trying to land this deal and getting it set up to lower your current housing payment as opposed to being able to just generate a deal that totally pays for you entirely from a duplex.

My parents put up most of the money for the down payment and they're crediting 10% of the rents as equity to me each month as payment for managing the property until we reach an equal equity position. 

I have assumed their leases and added an addendum that includes a few items (no auto renewal, new payment address, etc… ) which I am planning on asking them to sign.I sent non-renewal letters about a week after closing (early April), which gives them way beyond the 30 days' notice.

The first one is to just trust the algorithm and let it set your prices; the second way is to have a different base price and settings for the low season.

You want to invest just to have a place to live and potentially offsetting your mortgage payment by renting out the vacated rooms or having x amount of cashflow in the future?