6 to 7 k tops for that car. Unless it's a total museum piece. I would check every square inch of that body for rust, being that you are in northern IL, before making any offers.

Typical span on eBay for the later models:
96-97 non turbo 210s 4-6 k
98-99 turbo 210 5-8 k
05-06 CDI 211 10-13k

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech