From the World Trade Center and Times Square in New York to the White House and sports venues across the country, police patrolled in packs and deployed counterterrorism teams Monday as security was stepped up after explosions at the Boston Marathon.

WSJ: Security beefed up worldwide after Boston blasts

Even so, the privately held Embarcadero Center is worth twice as much as the World Trade Center was, on a per-square-foot basis.

FORBES: They Will Rise Again

As for 3 World Trade Center, Mr. Silverstein needs a tenant of at least 400, 000 square feet to continue, based on a 2010 subsidy deal with government agencies.

WSJ: New Hitch in Ground Zero Plans: No Takers

New York is hosting a job fair at Madison Square Garden Wednesday to assist those displaced by the September 11 attacks on the World Trade Center.

CNN: Recovery: News puts markets on edge