Relevance of lease guaranty in retail space

[Nikolas Engel]

Hi BP community  - I need to draw on your knowledge and experience again. 

I am confused about the relevance of a lease guarantee in the lease agreement. If tenant goes out of business, he still owes rent for the remaining time of the term - so what extra security does a guaranty provide and how does it play out in practical real life situations?

How important is a lease guaranty for you when negotiating a lease agreement with a retail tenant?

In our current negotiation with a tenant on a ten year retail lease agreement, tenant is offering two year guaranty and a rolling 12-month guaranty thereafter.  What do you think about that proposal and is a rolling guaranty something that is usual business practice? 

Thank you for your support!