A clear rent roll, showing what each unit actually pays and for how long, lets a buyer underwrite the property's income rather than guess at it, which supports a stronger offer than a listing with no documentation at all.
It also protects you as the seller: a documented rent roll shows exactly what obligations transfer, so there is no dispute later about a tenant's rent, deposit or lease term.
Pull your leases and payment history together before you list, not after an offer arrives. Get your hand-reviewed valuation from Joel Dyck.