If it's a single family property not in an LLC, I know of a couple options for HELOCs. Otherwise, for other property types or properties in an LLC, a closed end second (HELOAN) is probably your best bet. Feel free to connect.
Some companies offer Closed end 2nd HELoans using DSCR as qualifying income up to 75% CLTV. Feel free to PM me and I can point you in the right direction.
@Sanjaya Jayawardena- what amount are you needing ? do you want to do a HELOC or a 1st mortgage cash out refinance ? knowing this will be helpful ...fyi - there are not many heloc lenders for rental properties