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Sorry for your situation.
First, although you obtained a building permit - you still must construct and place the structure within the parameters of the local zoning code.
Second, you asked:
I was wondering if the approval I received from building department verified the distance from the property line or is that not there responsibility.
That is not their responsibility to measure the setbacks of where you place your structure - you are required to place the structure as per the zoning ordinance.
Also I would like to know what I should do that could make me finish this as quickly as possible.
My thoughts are - that I would apply for a variance given your situation. That you were told by the zoning officer when you originally constructed the "pool house" or "shed" (however you want to characterize the building/structure) that you only had to be 15 feet away from property line - you went 17 feet (more than required at the time).
That usually they will give a variance when you have already applied and were given a permit, AND that you can't move your structure without committing economic waste, AND that your electrical pipes have already been placed.
It's usually not that hard to get a variance given your situation - it's just a procedure that you have to apply for such and state why you need it.
Then about the only thing you would have to worry about is a neighbor
complaining. If you get along with your neighbor on that side you shouldn't have a problem whatsoever getting the variance because they can come with you to the hearing and state that they are OK with it.
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