So today during our final walkthrough I noticed the house had a crawl space. After poking around I noticed the foundation looked to be slab concrete, with a section of cinder blocks. Directly above the cinder block section, on the main floor of the house is a wood fireplace and the chimney. The house was built in the late 70’s. We are not in a market where inspections are common. Is the slab/cinder mix normal, somewhat normal or way out of left field? How concerned should I be? Here is a picture: