Staying or Not, Wall St. Giants Could Reap Aid
Dozens of multimillion-dollar federal grants will be offered to some of most important financial companies in world, to keep jobs in Lower Manhattan or lure them there; money is part of $500 million in federal aid intended to protect vibrancy of city's historic financial district; following Sept 11 attack on World Trade Center, many companies scattered, with as many as 30,000 employees relocating to New Jersey and Conn; Bloomberg administration has not disclosed names of companies designated for aid, or amounts; cash grants potentially raise thorny questions about which companies are viewed as more valuable and whether incentives will reward companies that are abandoning financial district; although cash incentives are not new, these have unusual characteristics, in that they will be more public and will be discretionary, and criteria are not crystal clear (M)