  We construct a class of CFT's which describe space-dependent closed string
tachyon backgrounds, as the IR limit of GLSM's in which the FI-parameter is
promoted to a superfield. Whole process of tachyon condensation is described by
a single CFT. We apply this construction to several examples, in which target
space is deformed drastically, and the dilaton background may vary, as a
tachyon condenses.
