cryptic apartment abbreviation

So the apartment hunt continues. It's actually kind of fun, figuring out Ad-Speak. I'm pretty good with acronyms and abbreviations, (and you'd be hard-pressed to find a vowel in any of the words in a typical real estate ad in the Times...) but I must admit I was stumped at first to see an apartment described as WBFPLC.

Go ahead, guess... I'll wait. Here's a hint: the apartment in question is in the 70's on the West Side. Answer.