I think the key to answering your question is inside of the Condo Documents that you were given prior to or at closing.
The documents are very specific about the Home Owners Association and the fiduciary duties of the developer.
Usually the developer retains control of the HOA until the property is 50% to 80% sold out depending upon the structure of the HOA entity.
There are financial sureties and bonds which must be in place in order for the developer to be given condo status for the property.
I have found that people become VERY RESPONSIVE when you start to make a claim against their bond, because bonds are personally guaranteed by the principals personal assets.
The only way the building is no longer a condo, is when the declaration or condo docs are voted out by the members in good standing of the HOA, if that can be done.
Its going to be sticky no matter what and I hope that you purchased because you liked the building, location, what it has to offer and is affordable for you. If you are going to be in for the long-haul of 5 to 10 years then this is really not going to be much more than another speed bump on the road of life.
The best thing that could happen is that the bank forecloses and they manage the property while they try to find a new builder to finish things.
The current owners will never do anything and i would suppose they don't have the money.
Having said that, i would go to the local municipality and file a complaint with division that handles enforcement of housing violations.
Sometimes, they can fix the problems and lien the property.
Best of luck!