Section 8. Where several persons own condominiums in a condominium project, an action may be brought by one or more such persons for partition thereof by sale of the entire project, as if the owners of all of the condominiums in such project were co-owners of the entire project in the same proportion as their interests in the common areas: Provided, however, That a partition shall be made only upon a showing:

1. That three years after damage or destruction to the project which renders material part thereof unit for its use prior thereto, the project has not been rebuilt or repaired substantially to its state prior to its damage or destruction, or

2. That damage or destruction to the project has rendered one-half or more of the units therein untenantable and that condominium owners holding in aggregate more than thirty percent interest in the common areas are opposed to repair or restoration of the project; or

3. That the project has been in existence in excess of fifty years, that it is obsolete and uneconomic, and that condominium owners holding in aggregate more than fifty percent interest in the common areas are opposed to repair or restoration or remodeling or modernizing of the project; or

4. That the project or a material part thereof has been condemned or expropriated and that the project is no longer viable, or that the condominium owners holding in aggregate more than seventy percent interest in the common areas are opposed to continuation of the condominium regime after expropriation or condemnation of a material portion thereof; or

5. That the conditions for such partition by sale set forth in the declaration of restrictions, duly registered in accordance with the terms of this Act, have been met.