All of our buildings are pre-1978... Granted, I do not operate in an overly-regulated state like CA or MA, but the risk of lead exposure is extremely low.
We have a LBP and Radon disclosure tacked on to each lease. We don't have paint chips laying around and we usually advise our tenants to not eat paint. Also I have not been able to find credible evidence of anyone ever having ill effects from radon gas in their residence.
People will say a lot of scary stuff about it, but sometimes it's ridiculous. Few of our ancestors died of lead exposure, and they all had it in their houses. If your painter is using a heat gun to strip wallpaper and heats the paint to 1100 degrees... your building will burn down before his brain can swell. (Paper ignites around 450 degrees)
IMHO, the real risks involved with lead paint are legal, not medical. On that, you need to educate yourself on your local and state laws, not on a forum full of (often helpful) hear-say. Then you weigh the risks... and probably paint over it.