Selling 4-plex in CO this Spring, get existing tenants on leases?

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I am helping some family members prepare to sell a 4-plex in Denver, Colorado this Spring/Summer.  They currently have 3 out of the 4 units rented to long term renters but they don't have lease agreements.  They've been just going month to month.  I assume getting the renters on new lease agreements will make it more attractive to buyers.  Do you guys agree?  Thank you!