Or just pay your sister a finders fee for getting the deal?

A common misconception is that real estate properties under $1M have a smaller tax basis and therefore do not benefit from a cost segregation study due to the associated fees.

The interest rate and loan term remain unchanged.Fees: Most lenders charge a fee for recasting, typically ranging from $100 to $500.

And that’s before factoring in selling costs—commissions, taxes, and closing expenses.

Quote from @Brandon Leffler:I may sell my condos in CA as the HoA's have climbed to 400$/mo I wouldn't sell your condos solely based on HOA fees being $400/mo.

The law does NOT apply to landlords:With less then 5 rental unitsThat live in one unit of a duplex and rent out the other unitThat rent out rooms in the home they occupySo, landlords can no longer state in their rental ads, "Section 8 not accepted".The reverse is also true, "Section 8 only", cannot be used.We've always recommended screening S8 tenants the same way as cash-paying tenants.Landlords waiving application fees and/or security deposits only for S8 prospects may also be violating Fair Housing.

Building a solid team is another crucial factor.

Quote from @Sami Gren: I start by making the original tenant fill out a form requesting to add a new renter, and they pay me a $50 processing fee (I charge a $50 fee any time I make changes to an existing lease). 

The issue I see most is the cashflow gets crushed by HOA fees and the added headaches of having them tweaking rules etc. 

It is very time consuming to get permit approvals and you may be in a position where you need to extend, pay fees, etc.. when your loan is past due.