It sounds like some pretty good facts to escape your lease. But with three years rent at risk, I would take your lease and the notices and consult with a local real estate attorney. I could imagine some rental clauses that could be troublesome.
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I know you know this, but the time to have a consult with a local real estate attorney is before you sign a lease for a commercial space. Commercial agreements are purely creatures of contract. There are no statutory safeguards to protect you as there are in residential tenancies. Your lease is going to say who is responsible for what. It may be that you contracted to do all the maintenance and keep the place up to code. Maintenance is not automatically a commercial landlord's obligation.
No one can really give you accurate advice beyond these vague generalities without reviewing your lease. In Seattle, Scott Weaver at Carney Bagley or Evan Loeffler or Mike Daudt would be good choices.
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