Lastly you could try a reputable general contractor that has a long track record of local work. They wil be tuned into the changes in building practices over time and may help identify the lineage of upgrades and remodels.
Your inspector will be able to get most of those answers for you. Terry was correct in contacting the Health Department for the as-built. Purchasing bank-owned homes is simply a waiting game. If you are in no hurry to move in and you see potential in the home, then you could be making a great decision in buying bank owned. Best of luck.
Windermere RE Lake Tapps Inc.