U.S. office vacancy rate rises marginally in fourth quarter - Reis <!-- no image --> <div>The U.S. office vacancy rate rose marginally to 16.8% in the fourth quarter from a year earlier, according to real estate research firm Reis Inc.<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=rdlO9KUSBhs:vLBQr20s0R0:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=rdlO9KUSBhs:vLBQr20s0R0:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=rdlO9KUSBhs:vLBQr20s0R0:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=rdlO9KUSBhs:vLBQr20s0R0:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=rdlO9KUSBhs:vLBQr20s0R0:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/rdlO9KUSBhs" height="1" width="1" alt=""></div> Posted by Reuters