Can two leases overlap on one unit? The double-booking guard

No — a unit holds one direct tenancy at a time, and Nexxus enforces it at every gate where a direct booking is born or moved:

• generating a lease from an application (checked before the applicant signs or pays),
• moving an applicant to tenant,
• creating a booking manually,
• editing a booking's dates.

When a conflict exists, the denial names the sitting tenant and their dates, so you immediately know what's in the way. The application page and the lease wizard also warn you early when the requested dates overlap a stay or a calendar block.

Back-to-back is fine

A new lease may start the same day the old one ends. Nexxus treats nights as checkout-exclusive — the departing tenant's last night ends the morning the new tenant arrives, so same-day turnover needs no special flag (deliberately unlike Buildium's same-day-move-in setting).

Swapping tenants mid-month

Shorten the sitting booking's end date first, then create the new tenant's booking. The guard will confirm the lane is clear.

Exemptions

• Room-by-room properties — concurrent stays are the model, so the guard doesn't apply between rooms.
• Airbnb stays — imported or arriving through the live Airbnb connection, they record stays Airbnb already sold, so they're never blocked. An existing Airbnb stay does block a new direct lease over the same dates: the unit genuinely isn't available.

Blocked dates (an owner stay, a closure) hold the nights too: a direct booking, a lease or a move-in over a calendar block is refused, naming the block. Remove or shorten the block in the property's Calendar & Pricing tab first, or pick other dates. A stay may start the day a block ends.

Across Airbnb and your booking site

The guard covers bookings you make in Nexxus. For nightly channels, Nexxus keeps them from selling taken nights in the first place:

• Every non-cancelled stay on the unit — Airbnb, direct, monthly or a long-term lease — plus every blocked date is pushed to a connected Airbnb listing as unavailable, usually within moments.
• Your booking site only offers open nights and re-checks the dates when the guest pays. Approving a booking request re-checks them too.
• Two guests can't both be charged for the same nights. The nights are held while a guest pays, the card is charged only once the nights are theirs, and a guest who loses the race isn't charged. If a card was already charged for nights someone else took (a rare late payment), Nexxus refunds it in full automatically and emails the guest.
• If Airbnb sells nights a paid booking-site stay already holds, in the moments before the closed dates reach it, Nexxus raises an urgent Double booking notification so you can cancel and refund one.

Why the guard is strict

A double-booked unit corrupts everything downstream — two rent schedules on one unit, occupancy over 100%, and a payout run trying to pay an owner twice for the same nights. Nexxus refuses at the front door so you never have to untangle it at the back.