Alexandria Real Estate Equities Inc. late Tuesday said that it plans to make a public offering of 4 million common shares.

The Pasadena real estate investment trust has not yet priced the offering or set a date, but if all shares and an over-allotment option are exercised, the offering could raise $335 million at Tuesday’s closing price.

Alexandria specializes in health care and life science properties, and plans to use net proceeds to pay down its unsecured line of credit, fund acquisitions and developments, and for general working capital and other corporate purposes.

Bookrunning managers are BofA Merrill Lynch, J.P. Morgan Securities LLC, Goldman, Sachs & Co., Barclays Capital Inc., Citi and RBC Capital Markets, which will have 30-day option to purchase up to 600,000 additional shares to cover any over-allotments.

Shares closed down 45 cents, or less than 1 percent, to $72.91 on the New York Stock Exchange before the announcement, and were down 4 percent in after-market trading.