You could use a "multi tool" or undercut saw (sometimes called a jamb saw) to cut the bae flush with the floor. HD or Lowes both sell them. Harbor Freight has a cheap version of the multi saw for about $35.00 I believe that would likely suit your purposes. The Dremel brand is around $100.00 and HD used to carry a jamb saw (in the flooring dept.) for under $100.00 if memory serves. I bought one several years ago and it seems like it was in the $70.00 range. Not sure though. The multi tool has a lot of other uses so it may be worth buying a better quality one....
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