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Juno Therapeutics Inc. is about to upgrade its South Lake Union headquarters.
Juno is preparing to occupy 241,000 square feet over nine floors of its newly built headquarters at 400 Dexter Ave. N., according to a filing with the Securities and Exchange Commission.
The biotech company's seven-year lease is expected to start around May, the filing said.
Alexandria Real Estate Equities (NYSE: ARE), which is developing the 12-story building, broke ground on the $232 million project in summer 2015.
Seattle…