Undedicating a Temple?

I was looking at one of those sites on what happened on this day in
history and it said for 27 March that the Kirtland temple was dedicated.


When a temple - Kirtland, Nauvoo - can no longer be used for its
intended purposes is there any rite or ritual to undedicate it so that
it can be used for secular purposes?


And the same with meeting chapels and stake centers when they are no
longer used?  

I was just curious also why the LDS would sell their meeting hall to
another religious group?  Is this often done when the (LDS) church
expands and needs more room?

In a nearby stake they tore down the old meeting hall and built a new
stake center on the site but I saw in another stake they sold the
meeting chapel building to another religious group and bought new land
to build the stake center.