Just make sure to verify the freshness and accuracy of the data.• Public Records & County Websites:Local county appraisal and tax records can be a goldmine for owner information.

I have been using them and the sourcing people they incorporated for a few years now and the accuracy of returned contact information has always been above 90%. 

I purchased Air DNA pro subscription , any thoughts on accuracy of AirDNA numbers for Boston market.

@Max Bellino For smaller properties like your 2–4 unit multifamily buildings, an online cost segregation study is a quicker and more cost-effective option, providing sufficient accuracy for straightforward properties.

Consulting a tax professional is recommended for accuracy.

They are the only one that can answer you with 100% accuracy. 

you will still have to hit the phone, keyboard and pavement, but accuracy and reports are superior.   

Yes it does 90% but you still have to look over it or double check accuracy like you said.  

Property taxes and insurance costs are best obtained through local county websites or reaching out to insurers directly for quotes specific to the area.Tools like BP Pro and Reventure can be helpful for an overview, but it’s a good idea to validate their data against primary sources to ensure accuracy.

. ;-)But regarding the D.C. market From old "legacy news" station: (so, I can't be sure of it's accuracy)"President Donald Trump’s moves to fire thousands of federal government workers have coincided with a surge in jobless claims in Washington, D.C., that could get worse as the efforts intensify.Since Trump has taken office, nearly 4,000 workers in the city have filed for unemployment insurance as part of a surge that began at the start of the new year, according to Labor Department figures not adjusted for seasonal factors."