Madalyn,
Perhaps money laundering is a big problem in the area. Certainly many people on this forum have speculated as much. And perhaps it's for this reason that so few "really fine eating establishments" have opened in the area. But then are we to believe that money laundering is unique to Jackson Heights? Why don't Astoria, Sunnyside, and Forest Hills, which all boast equally exorbitant commercial rents, seem to suffer from this problem?
If it's true that many of the businesses in the area are fronts, then an investigation is demanded. But I have another theory. I suspect that the lack of trendier restaurants in JH reflects the neighborhood's lack of trendier, i.e., less affluent, upwardly-mobile, demographics in the area. This isn't to say there hasn't been an influx of professionals moving into the area. But Jackson Heights is a largely cooperative neighborhood, meaning long-time residents can't simply be priced out of their homes. And these long-time residents might like their Columbian and Mexican and south-east Asian restaurants. Enough, perhaps, to keep them operating legitimately.
Or is there concrete evidence of serious mischief?