NEW YORK (AP) — Blackstone Real Estate Partners is buying BioMed Realty Trust Inc. in an all-cash deal valued at $8 billion. The deal, for $23.75 per share, marks a 10 percent premium to BioMed's closing price on Wednesday. San Diego's BioMed, which owns properties in the drug development and life sciences industries, said Thursday that its board of directors approved the deal.