Is there a better solution than a lint trap for venting a clothes dryer indoors?
According to Chicago Building Code 


  18-28-504.1  Installation.
  
  Clothes dryers shall be exhausted in accordance with the
  manufacturer’s instructions. Dryer exhaust systems shall be
  independent of all other systems and shall convey the moisture and any
  products of combustion to the outside of the building.
  
  Exception: Where the make and model of an electric dryer is known
  and the manufacturer’s installation instructions do not require
  exhaust, see Article 4, Ventilation for room exhaust requirements.


Venting a dryer inside is a potential fire and mold hazard, and can negatively affect indoor air quality causing sickness (and/or death, maybe).  

You should bring this up with the condo association, the building owner, and potentially the building inspector.  A possible down side to this action is, the condo association could ban the installation of dryers altogether.  So you'll want to try and suggest some alternatives.

I'm going to guess, the condo association is worried about the appearance of vents sicking out all over the building.  A potential appeasement would be to select a nice looking vent (voted on by the condo association), and force anybody who installs a dryer to use the same vent. 

They may also want all vents to be installed in similar locations, so the vents are uniformly placed on the building.  A good way to insure this would be to install all the vents at once, including installing vents for units without dryers (in which case they should be sealed until in use).