The wood floor inside is also slightly soft.

if not and the sheetrock isn'tsoft - scrape , spray bottle bleach , let dry ,skim with joint compound & paint bad areas with Zinzer B.I.N and paint with semi gloss ceiling fans only workif they turn them on, semi helps repel the moistureIf the sheetrock is soft, rip it out and replace, the picture doesn't look likeit's serious enough to need that though.

If not, moisten a soft cloth with this solution and wipe the surface.

I'd look at a soft white on everything, including brick, and black railing.

@Rich Hupper timber is not universal.. what is valuable out here in the west may not be the case out your way.hard woods are not nearly as valuable as soft woods per acre. simply because of how they grow.think of pine and doug fir trees.. 3 feet around and straight up for 100 feet  and a stem every 5 to 10 feet.. think of Hardwood big trunk big canopy stem every 100 feet plus.. simply no where near the board feet per acre.Its not uncommon in our area to have 50k bd feet per acre were in hard wood country it could be a tenth of that. but I digress into logging minutia that most folks could give a rip about.. but I made millions doing it  LOL.. so there. !

It's not an insignificant amount of hard capital and that doesn't factor into the soft costs like losing out of deals because you had to deal with "the IT guy" instead of vetting deals.  

The counter top is quartz and all the cabinets are real wood/ soft close functionality.  

I would assume driving or pushing a pier through sand and soft clay if much easier then gravel and rock.

Walk softly but don't be afraid to wield the stick!

Make sure to find out about the soft costs, like permits, impact fees, etc.