After a nearly four-decade drought, two separate air-rights projects with a combined cost of $1.7 billion are taking shape, including one set to be a major life sciences hub in the city.

The 1.3-million-sq-ft Fenway Center air-rights project in Boston includes a 90,000-sq-ft deck over the Massachusetts Turnpike next to Fenway Park.

Developer Steve Samuels began work on a $700-million air-rights tower complex over the Massachusetts Turnpike in Boston.

Developer's attorney claims the court ruling, which cites zoning irregularities in nearly done Manhattan luxury condo, could invalidate certificates of occupancy for 20 city buildings.