Poor soils can be managed with good foundations. You can put a building on water with the right foundation design. In the case of an office, the safety factors in design are usually pretty high. I’m assuming soil sampling is for modified proctor density. Usually, the criteria for those are fairly arbitrary. Some soils are so sensitive to moisture content that density measurements aren’t very informative. Not blowing up a multi-million dollar construction schedule over a few mm of consolidation is probably a reasonable take.