found this on the net:

Q: I am considering buying a house that has a large wall of mirrors I would like to remove. The mirrors are about 2 feet square and have been in place for 40 years. Any thoughts on how they might be attached and how difficult it would be to remove them?

A: They’re probably glued right to the wall, which means lots of work and damaged plaster or wallboard. I had a similar problem with corkboard glued to plaster, and I never was able to get it all off.

But a reader passed along a great suggestion: If the mirror tiles are held by adhesive foam-tape squares, frequently these can be softened and removed by heating with a hair dryer or heat gun until pliable.

Or, you could use a solvent to take care of the glue and loosen the mirrors, sand the remaining adhesive off the wall, make any needed repairs, and prime the walls as if they had new drywall, then paint. But introducing the often-dizzying odor of solvents may not be an option if you or members of your family are chemically sensitive and the area cannot be ventilated enough to prevent the indoor air quality from being compromised.

Someone else suggested steaming the mirrors off the wall and loosening the adhesive as one would wallpaper paste. But the glue used for sticking mirrors to a wall is different from paste.

Bottom line: This is not a task I’d take on myself. Talk with a wallpaper-removal professional, who probably deals with this sort of thing all the time.

call a glass company to remove them. might even get a discounted price if you sell the mirrors to them after removal.

this way they are held responsible for any damage and they have the exertise in removing such items and know how they are normally attached.

unless you want to lay down sheets and just take a hammer to them, I'd call an expert in on this job to be safe.

You may have to break one to get a starting point by which to pry them off. Try putting a giant X of tape across them prior to prying so the glass doesn't shatter so bad. Have a big drop-cloth on the floor to catch them for easier clean-up. Good luck!

get the room warm lets say 80 degrees inclucing the back of the wall in the other room after this use a hair dryer to warm each mirror up the slowly then pry off easily

break one to get a start,then use something like a long sturdy puddy knife to pry the others off !!! those tyles really stick,so regardless on how you remove them, your going to have major wall repair !!!!! might as well get some rocks and have fun !!!!! lol....

Bite the bullet, you've got to try to take them off, they may come of easily, they may not, if the latter occurs,and the wall is full of holes just drywall over the top, it's not the hardest job in the world.

First just face it, you are going to end up replacing all the drywall if the person who put it up knew what they were doing and used standard mirror glue. To start you must sacrifice one mirror! I recommend starting in the center by putting an old towel over a mirror tile and hitting it gently with a hammer unti you hear the crack. Please be careful not to have your hands below the mirror as a sliver may fall and stick in your hand. You can then use a small flat screwdriver to pry the pieces out, protect your eyes! After that one is out, use a sturdy paint scraper to get under any one of the surronding tiles and pop them off. Always protect your eyes! As the glue tends to adhere differently across the surface you may have to work along the available edge to make it pop. Hope you like doing drywall. I always just face the fact that buying 3 or 4, 4x8 sheets of drywall means a lot less plastering than the whole wall :) Hope that helps.

If I were you carefully break one somewhere near the centre and try and work outwards, you will probably find they are not all that soundly adhered so being careful not to damage the wall too much start prying, be prepared to take it slowly, they probably used some kind of tile cement which should clean off the wall fairly easy with an electric sander.

Before I go to the hammer, I would use a little thought.

First, find out how the mirrors are attached. There are two probabilities. One is double-face foam tape, the other is adhesive pastes.

To find out, take a long, slim and sharp kitchen knife and slide it behind a mirror. If you can feel some softness and saw through the material between the mirror and wall, the method is foam double side tape. You will be able to cut them away.

If the adhesive surface is hard and resists cutting, it is probably a paste type. This is similar to construction adhesive applied with a caulking gun. If it was installed with small dabs, you may be able to pop them off the drywall either with light leverage or break the spot bonds by using a slim metal bar like a chisel, tapping it sideways under the mirrors one at a time..

Last option- if the adhesive was really put on heavy, you may need to break the mirrors up, then clean up the wall. If you do that, consider draping the wall with visqueen plastic to prevent shards of glass from covering the area. A second drape on the floor will allow easy pick up.