Ask if the condominium fees have increased a lot each year, or do they remain consistent with inflation. Check if the condominium is well constructed. Visit when the neighbors are home and listen for noises through the walls. If you hear common level noise then the walls are not sufficiently soundproofed. Get a copy of the Rules and Bylaws of the condominium from the managing agent.
Most rules are just common sense guidelines regarding noise and parking.
Make sure there are no restrictions that will conflict with your lifestyle. Check what the monthly fee is and what it is comprised of. Compare that fee with other condominiums in the area. Some complexes may have a more efficient management and therefore have lower fees. Try to avoid condominiums that include utilities in their fee, as this is the most expensive way to pay for utilities.