The vacation rental company is offering this unbelievable 1-night stay under the New Year's Eve Ball at Times Square. The lucky person who books this, along with their guest, will stay on Nasdaq's outdoor terrace ... where they'll sleep and chill inside their very own geodesic dome, with panoramic views of the crystal ball and the Big Apple for that matter.

But, wait ... there's more!!!

Mariah's virtual hosting duties include her serenading the lucky guests. Plus, there's also a $5,000 shopping credit for shops along Fifth Avenue or local Times Square shops.

And, while the world counts down to the end of an awful 2020, guests will enjoy access to an indoor lounge where they can relax, drink some bubbly and watch the world celebrate on TV. Dinner will be provided by a private chef. And, how's this for a cool memento ... a sparkly piece of the crystal featured in this year's Waterford Crystal Times Square NYE Ball design.

This all sounds incredible, for sure. The 1-night booking's just $21 ... but there's a catch.

It's on a first-come, first-serve basis but only open to guests who can prove they're NYC residents. They must also currently live in the same household and must meet COVID health and safety criteria ... like documentation proving they're COVID free.