What is the best type of commercial lease?

I suggest you consult with an attorney who handles commercial real estate transactions. I suggest you as what charges you will be responsible for - water, heat, electric; what alterations are allowed; what repairs will the landlord cover; if the landlord will abate rent for COVID shutdowns.

It depends on the terms of the lease. The apartment is not habitable at the moment, so you should at least get a rent abatement. You should have a Colorado attorney review the lease.

It depends on if there was a written agreement or a verbal agreement for your options. Sending a demand letter from an attorney followed by negotiations could help resolve the problem and avoid litigation. If the landlord remains unreasonable then you will likely have to file a lawsuit. Please resubmit as a proposal at the following link so attorneys can bid on the project: https://www.contractscounsel.com/client/create-project/step-h1?cta=4.

I hope that you used the assistance of a WA State commercial real estate attorney to advise you in the writing and presentation of your offer to purchase a commercial property, as these can be extremely complicated. (Or, at the very least, I hope you were represented by an experienced and knowledgeable buyer's agent). To my knowledge, this type of PSA agreement is not required to be confidential unless you included that language in your offer. Please be aware that once the sale closes, the amount of the purchase price will be public information, in county records.

Generally speaking, one party to any sort of contract cannot amend any sort of contract unilaterally…however, review your lease very carefully to see if you granted the landlord any such rights when you signed your contract—for example, that the landlord could increase the rent if his property taxes or insurance increases.