Commercial Building Disclosure question

I bought a commercial office building with 2 office suites with 10 offices on each side. We had a building inspection and appraisal prior to closing and there were no disclosures.

A few weeks after moving in we can't figure out why we can't get internet or phones to work on the B Suite and we have an electrician trace wiring from the jack plates through the attic. For the B suite, all the wiring comes into a bundle and is running inside a wall but was never hooked to a patch panel, so it is just a bunch of cut wire in a wall.

The seller did not disclose the unfinished wiring and the inspector could not test the phones or internet since there was no service. I am told the inspectors do not test low voltage wiring in a commercial building. It will cost between $3000-$4000 to rewire this mess.

My realtor is telling me that it will be hard to prove the seller knew about the unfinished wiring but does this matter? Is there any way for me to recoup the cost to finish out this wiring?

Real Estate Attorneys, Realtors and Property owners please advise...