I don’t charge a pet deposit or pet rent but I do put in the lease that the tenant is responsible for any and all pet damage.

This should be defined in the lease agreement as to how it's covered (by the tenant or landlord) and how they're switched over when turnover occurs.2) Not sure if I'm understanding correctly, but any fees paid to the property manager should be separate. 

My offer to purchase was successfully accepted in a competitive market, and I immediately found a tenant to rent out the space for a 12 month lease.

I've been working with job titles like construction project manager, who doesn't know a lot about construction but coordinates architects, engineers, GCs etc, the VP of RE management, who also does not know a lot about construction but oversees site selection, lease negotiations, property management, RE accounting who writes my checks and does annual CAM audits, and other jobs like that.

If they do, it's a lease violation.

Both signed the lease, so I think I split it in half and give it to both and let them go fight it out.   

Study and read your local lease templateRead, read, read.Watch youtube videos online of some basic building and construction.

I am also considering selling the property next spring so this would be the last lease and I don't to play nice. 

If they are high maintenance, you can also have a talk with them along the lines of if they aren't happy there, they are welcome to give 30 days' notice and not pay the penalty for breaking the lease. 

How often do tenants on month to month need to resign lease?