Housing
Housing Inventory: Median Listing Price per Square Feet, Capital Region Counties
Data Source: Realtor.com, Housing Inventory: Median Listing Price per Square Feet in Rensselaer County, NY [MEDLISPRIPERSQUFEE36083], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/MEDLISPRIPERSQUFEE36083, June 26, 2022.
Average Randon Levels by County
If you live in the Southern Tier, you should have a real reason to fear going down to the basement.
Houses Heated Primarily with Wood in Southern Albany County
Residential Median Sales Price, from NYS OPHRP
States that Encourage Accessory Dwelling Units
200-Year Old Houses in New York State
I was playing around with the NYS GIS / Tax Map Feature Service, and realized it was pretty easy to query any building that was built in the state prior to 1820. The trick is keep the query narrow enough so you don't request too many points -- the feature server is limited to something like 1,000 points per request, although your browser will crash before then.