2.4.0.82115100 - Disclosure - Subsequent events (Notes)truefalsefalse1false falsefalseD2013Q2YTDhttp://www.sec.gov/CIK0001035443duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_SubsequentEventsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Subsequent Events [Abstract]2false 2us-gaap_SubsequentEventsTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Subsequent events</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">Ariad Pharmaceuticals, Inc. Expansion</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">July&#160;3, 2013</font><font style="font-family:inherit;font-size:10pt;">, Ariad Pharmaceuticals, Inc. executed a letter of intent (&#8220;LOI&#8221;) to lease an additional </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">139,374</font><font style="font-family:inherit;font-size:10pt;"> RSF for a </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">15</font><font style="font-family:inherit;font-size:10pt;"> year term at our 75/125 Binney Street development in the Cambridge submarket of Greater Boston. An amendment to their lease is under negotiation to increase their lease to </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">383,497</font><font style="font-family:inherit;font-size:10pt;"> RSF, or </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">99%</font><font style="font-family:inherit;font-size:10pt;"> of the total RSF of the project.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">Sale of land parcel at 1600 Owens Street</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">July&#160;8, 2013</font><font style="font-family:inherit;font-size:10pt;">, we executed a purchase and sale agreement to dispose of our land parcel at 1600 Owens Street in the Mission Bay submarket of the San Francisco Bay Area for an aggregate sales price of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$55.2 million</font><font style="font-family:inherit;font-size:10pt;">, inclusive of certain parking spaces. This sale is expected to close in December 2013.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">Acquisition of 10121/10151 Barnes Canyon Road </font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">July&#160;5, 2013</font><font style="font-family:inherit;font-size:10pt;">, we agreed to make a </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$13.1 million</font><font style="font-family:inherit;font-size:10pt;"> investment in 10121/10151 Barnes Canyon Road, an approximate </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">116,000</font><font style="font-family:inherit;font-size:10pt;"> RSF office property located in the Sorrento Mesa submarket of San Diego.&#160; Our investment will be funded in </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">two</font><font style="font-family:inherit;font-size:10pt;"> installments: &#160;i) </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$5.4 million</font><font style="font-family:inherit;font-size:10pt;"> to be funded in August 2013 (which will earn a </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">7%</font><font style="font-family:inherit;font-size:10pt;"> return until the next payment is made), and ii) </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$7.7 million</font><font style="font-family:inherit;font-size:10pt;"> to be funded no later than October 2014.&#160; The property is currently </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">100%</font><font style="font-family:inherit;font-size:10pt;"> occupied with leases that expire in 2014 and 2015. 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rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="8%" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" 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style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">April 2017</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">January 2019</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td 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