I was able to then renegotiate and get the seller to cover closing costs so I only had to pay inspection out of pocket.

Your time is better spent now trying to figure out how to be exceptional enough in your craft (or move to correct location, or get a new job and renegotiate) to be able to get higher income.

At the end of the lease term, you have to renegotiate the lease or sell.

Renegotiate the lien on the house.

If they’re wrong the renegotiation is so much easier. 

Do you renegotiate the price per one of the "subject to" out clauses built into your PA?

Any sale, lease, or re-lease of any portion or all of the Property, any negotiation or re-negotiation of indebtedness secured by a blanket lien, the hiring of any property manager, or the negotiation of any property management agreement (or any extension or renewal of such contract) must be by unanimous approval of all Co-owners.

I need someone to look over and renegotiate a commercial lease I'm inheriting along with a business in the Santa Rosa, California area.

You can Keep it Simple and raise the rent by 4% every year (inflation is historically under 3% so you should make out ok), or you can index to CPI, or you can index to something like military BAH or GSA per diem.The other option is to just do one year leases and renegotiate. 

There also seemed to be a lot more room to renegotiate management or purchase contracts versus residential where people tend to tell you things are set in stone.