Scammed by Home Improvement Company- left with huge repair expense

There is a lot going on in your question. The short answer is that it depends on the facts of the matter. You should consult with an attorney.

How do I void a home improvement contract?

The general answer is that it depends on the terms of the contract. You should obtain a lien waiver and should, but are not required to, use an...

When we signed foreclouser

Your attorney is obligated to respond to your inquiries within a reasonable amount of time. You may want to send a letter to your attorney, return...

Is it safe to do this since there is a tenant actually living there full time?

You risk fines from the city and eviction proceedings by the landlord. As an alternative you may want to discuss this with your landlord and try to...

Please advice if it is needed to let client know about the agreement and let vendor know about the full-time offer from client

If the agreement is still in force due to the extensions or otherwise you may need to disclose the information. You should consult with an attorney.

Is the landlord violating zoning regulations by not providing parking in our R6 zone? If so, what cure/recourse do we have?

Not necessarily as there are some exceptions to the requirement. Assuming the facts are as you described and assuming the building is not subject...

Who is the current LEGAL Tenant? Stranger without Lease or People with the Lease?

Based on the facts you provided it is unclear who the legal occupant is. The police might be able to assist. However do not attempt to evict...

Can I get a full refund?

It depends on the written agreement, if any, and the surrounding facts. If you do have a valid claim you would need to sue in small claims court....

It is not the utility company's obligation to determine whether a person is legally occupying an apartment. Are you the landlord. Has the landlord...

Can I take legal action or break contract because of this of the deception?

It might be deceptive, but it is not illegal. Absent further evidence of misrepresentation it will be difficult to break the contract. Your best...