129. Conditions precedent to exercise of option.

Any matters which by the terms of the option are made conditions precedent to its exercise must be strictly observed1. Thus, the notice must be given within the specified period2; and, if payment of the purchase money at the expiration of the notice is made a condition precedent, the payment must be duly made3. It is not essential that the tenant is to have performed all the stipulations of the lease, unless that performance is made a condition precedent4. If performance of the covenants is made a condition precedent, the tenant satisfies the condition if there are no subsisting