http://en.wikipedia.org/wiki/Texas_Declaration_of_Independence
try that it even has a pic of the building there for you.
or here has a bit more info and the entire document and all the people that sigend for you.
http://www.lsjunction.com/
It was here that on March 1, 1836, delegates elected from each municipality in Texas convened in an unfinished frame building. While the forces of General Santa Anna laid siege to the Alamo, the Convention of 1836 declared Texas' independence from Mexico, wrote a new constitution which established the Republic of Texas and organized an ad interim government.
http://www.tpwd.state.tx.us/spdest/findadest/parks/washington_on_the_brazos/hist.phtml
These town promoters rented the only structure large enough for deliberations, an unfinished building, from entrepreneur Noah T. Byars.qv Although the town had an inn, most delegates could not find lodging. At Washington between March 1 and March 17, 1836, delegates signed the Texas Declaration of Independence,qv wrote the Constitution of the Republic of Texas,qv and established the ad interim government.qv To escape Antonio López de Santa Anna'sqv army, the Texas government and the inhabitants of Washington evacuated the town.
http://www.tsha.utexas.edu/handbook/online/articles/WW/hvw10.html