So, our 91-year-old Dad--currently in assisted living--has been officially diagnosed with dementia (Parkinson's and Alzheimer's), and the doctors believe he will need to move into a memory care unit in the next 3 months or so. Although he's got longterm care insurance, it won't cover all the costs, and we are looking at either renting or selling the house (a nice vacation place on Cape Cod). Fortunately, I've got POA, and we have an elder care attorney in the loop. However, what is a bit unclear are the tax implications. The land was purchased in the 1970s, and the house was built in 1982. How do we determine the basis for capital gains? I know the first $250K from the sale can be excluded, but I'm wondering if I have to dig through 30 years of files or if this sort of information would have been filed with the county (or somewhere else).