If this is in King County, WA, make sure you do your homework.
Is the property in an F (Forest Production) zone? If it’s in a Critical Area (look into the Critical Areas Ordinance) that’s even more restrictive.
All sorts of restrictions that you won’t even know about until you start trying to get something permitted.
Like only 10% impermeable surface. This severely limits what you can build. Setbacks from wetlands. Number of livestock animals allowed. Etc. etc.
My advice is if you are absolutely in LOVE with the property, hire an experienced land use attorney to FULLY check it out for you. Look at ALL the recorded documents, legal descriptions, surveys, easements, land use regulations, etc. BEFORE purchasing.
Good luck!