It all depends on what the $400 is compared to the monthly maintenance. You have to consider the ability of your shareholders to pay that much more per month for a year. Our building had an assessment that amounted to about 20% of the maintenance for a 24 month period to cover major facade and terrace work. The 20% seemed to be the most we could charge before it became a problem for a number of people in our building. If the $400 in your building is more like 40% of maintenance then look at charging a lower amount for a longer period of time and put off the work if possible.