Rent review- fixed or CPI but I have seen people enter a 10 year lease with7% review (and a market review on the 6th year)- and that was under lawyers advice! Sweet deal for landlord- crappy for tenant.
Just because a lawyer has reviewed the lease doesn't mean that the deal is commercial (as the commercials are part of the deal which was struck by the lessee/lessor, it was agreed).
Unfortunately a valuer has to see through the deal when it comes to determining market rent and value, capping the deal at x% isn't a cookie cutter solution as the sustainability of the cash flow isn't there.