Primary Home Creative Financing Help

[Nathan Frost]

So here is the deal and I likely will have to say no unless I can do some sort of creative financing.  I have found a house locally that I really love and want to move in as my primary.  However, it likely will double my current payments or at least by $600.  Anyway to structure this possibly or just wait and save money?  Not sure if there is a 40 year term for primary homes but thought I would see if possible. We currently only have a one car garage and could use the extra bedroom and garage space the new home has; plus in a better location for us.  Just been hard to find more spacious homes we like, because even if it is 100k more we are still seeing our payment go up like $800 with equity in the game.

New Home Asking: $259,000

Current Primary: $80-90k equity  / Could Rent for $1600-1700 per month