What is the difference between a cross lease and fee simple title?

A cross lease title is where multiple individuals own an undivided share of the underlying title and lease the area of their buildings for a period of 999 years from the other owners. As such the title is based on accurate depiction of the buildings on the land.

A fee simple or freehold title is based on the dimensions of the land and the owner has exclusive ownership of both the land and the buildings located that land.