You know that Matt Garrison tracks big price reductions on condos and single-family homes at CondoShark.com. But did you know he also keeps an eye on multi-unit buildings? Here are all of the two-, three-, and four-flats in Bucktown, the Gold Coast, Lake View, and Lincoln Park, whose prices have dropped by at least 20 percent since first going on the market.

Bucktown:

• 2346 W Medill Ave: two units, was $449,000, now $257,900 (43.2 percent off)
• 2341 W Montana St: four units, was $575,000, now $399,000 (30.6 percent off)
• 1657 N Paulina St: three units, was $629,000, now $475,000 (24.5 percent off)
• 2227 W Belden Ave: two units, was $499,999, now $399,999 (20.0 percent off)

Gold Coast:

• 1424 N North Park Ave: two units, was $699,000, now $500,000 (28.5 percent off)

Lake View:

• 3044 N Hamilton Ave: three units, was $799,000, now $449,000 (43.8 percent off)
• 710 W Melrose St: two units, was $1.2 million, now $900,000 (25.0 percent off)

Lincoln Park:

• 1824 N Bissell St: two units, was $499,000, now $399,000 (20.0 percent off)