Opinions on what to do with buying a house

You live in Minnesota where it freezes in the winter. The basement is 8' below grade and below the frost line. The porch was probably built with a 4' footing and maybe not enough for your location. A good contractor could repair the sag if the framing was in good shape. Look it over with a different view. Could you remove the room addition and rebuild with a slider and a patio? May be incorporate a fire pit area! Have a local contractor look it over and give you an idea whether it can be fixed or replaced. Offer to pay him for his time. The sinking wall problem could be a bargaining chip for a lesser price on the property.
On another note. It is very difficult to orchestrate the selling of your condo and purchasing a property at the same time. Many can't sell their present property and end up paying for two at the same time. Talk to your Realtor. tmm