Naperville offers 16 office units across 2 buildings, and the median lot is 40 m², which makes this a small-suite market rather than a floorplate one. Main Street Promenade on South Main Street and Central Park of Lisle on Warrenville Road hold the entire 16-unit inventory between them, with the largest single lot at 172 m². A team of thirty will not find one room in Naperville today — it would have to combine lots or take the 172 m² unit and accept dense seating.
Asking rents in Naperville run from $390 to $450 per m² a year, but the median is also $450, so most of the 16 units are priced at the ceiling and the $390 figure is an outlier rather than a negotiating baseline. A tenant budgeting for Naperville should model the $450 rate and treat anything below it as a win earned on term length or on taking a lot that has been sitting empty.
Choosing between Naperville's 2 addresses is really a choice of setting: South Main Street sits in the walkable downtown core, while Warrenville Road belongs to the east-west office corridor feeding the I-88 research belt. With only 16 lots in play, both are car-and-commuter-rail locations, and viewing every available unit in Naperville in a single morning is realistic.