Unusual Real Estate Negotiation

This was negotiated as part of a real estate lease contract.

One section of the lease deals with the term of the lease. It states:

"Subject to the provisions of Article XI relating to amendments, this declaration and the covenants herein contained shall be in effect until February 13, 2031. Notwithstanding the foregoing, this declaration shall become ineffective and the covenants herein shall be extinguished upon the expiration of twenty-one (21) years following the death of the last survivor of the following named persons and all children and other issue (including legally adopted children and the issue of legally adopted children) of the following named persons:

Ronald Reagan, Governor of California

John Lindsay, Mayor of New York City

Richard M. Nixon and his Daughters, Julie Nixon and Patricia Nixon

Lyndon B. Johnson, President of the United States, and his daughters Lucy Baines Nugent and Linda Johnson."

Now here's a negotiator that likes to have fun with contract terms.

How do you suppose the parties deal with the uncertainty of when the lease is going to end? I guess it's assumed to be so far in the future that no one really cares.

I'd hate to have to track each of these family trees and try to determine when the lease terminates!