By Agha Nawazish Ali Khan Since REITs are required to distribute 90 percent of their taxable income to shareholders to maintain their status, it becomes quite challenging for them to build capital reserves. Hence, capital markets serve as an important source to generate additional funding for acquisitions and ongoing operations. Year-to-date through July 1, office REITs led the sector with $3.37 billion raised through common equity offerings. Three office REITs—BioMed Realty Trust, CommonWealth REIT and Alexandria Real Estate Equities—each raised more than $500 million through their respective offerings, with BioMed Realty Trust leading the way at $668.6 million. The company…