Tenant proposing rent
Some leases require service of a rent review trigger notice which shall specify a proposed rent, in which case this should be included in the notice.
The wording used in the notice should be based on the relevant words of the lease. If the review clause states that a trigger notice must be served 'stating the amount that the Landlord considers to be the open market rent', then the notice could say 'I consider the open market rent to be [amount]'.
Failure to state the proposed rent in the notice may invalidate the notice unless the court considers that this element was not intended to be mandatory. The safest course is to comply exactly with the requirements of the review clause for the contents of the notice.
These are two form letters for such a proposal by the tenant, both formal and informal.