it sounds like ImageMagick wasn't built with TIFF support. did you compile it yourself or did it come from a binary package?
did you install the whole ImageMagick package with it's programs or just the libraries so you could use the perl module? if you have the programs check them.
$ identify housing.tif
housing.tif TIFF 900x1300+0+0 PseudoClass 256c 8-bit 2.2m 0.090u 0:01
$ convert housing.tif housing.gif
$ identify housing.gif
housing.gif GIF 900x1300+0+0 PseudoClass 256c 8-bit 486.9k 0.140u 0:01
if those don't work it's likely that your ImageMagick is missing TIFF and you need to find or build ImageMagick (and likely a libtiff) to get TIFF support.