Well probably the only "bank" involved was an investment bank. Typically they would issue bonds rather than taking out a mortgage. Some investors like the risk available with such corporate bonds.
Although this may not be a LBO situation, selling junk bonds is often the way that PE firms steal everything from firms they "buy". I have no idea how the "all-stock" claims jive with selling bonds. I suppose the buyer could just issue more of its own stock, if the numbers don't add up. [EDIT:] This last maneuver seems more plausible if the buyer itself was previously a LBO target and the PE dudes haven't totally drained it yet.
Although this may not be a LBO situation, selling junk bonds is often the way that PE firms steal everything from firms they "buy". I have no idea how the "all-stock" claims jive with selling bonds. I suppose the buyer could just issue more of its own stock, if the numbers don't add up. [EDIT:] This last maneuver seems more plausible if the buyer itself was previously a LBO target and the PE dudes haven't totally drained it yet.