explore whether useful to keep additional sales with change in file format

[lhendey]

ITSPE property sales (no longer published) with Tax System Property Sales (CAMA) - the CAMA file has multiple sales per parcel - if pulling quarterly not a probalby but as we didn't do an update for a year, there are likely some sales lost.
https://opendata.dc.gov/datasets/b1bc741677c04a59a862250d1290a8ad_57/about