A Rejection at 820 Fifth, A Sale at Trump Tower

• Real estate prices are plummeting and deep-pocketed buyers are hard to come by, but that hasn't changed things at 820 Fifth, the notoriously picky co-op where 89-year-old socialite Jayne Wrightsman reigns supreme. Jeff Blau, the 41-year-old president of The Related Companies, had been willing to pay a whopping $31…