Here are some Web pags on this:
"Phrases such as together with, as well as, and along with are not the same as and. The phrase introduced by as well as or along with will modify the earlier word (mayor in this case), but it does not compound the subjects (as the word and would do)." (http://grammar.ccc.commnet.edu/grammar/sv_agr.htm)
"When a subject is followed by a conjoining prepositional phrase such as as well as, in addition to, or with, the verb should be singular: Jesse as well as Luke likes jazz. The old school along with the playground is up for sale." (http://www.bartleby.com/64/C001/060.html)
By the way, I got these by searching google for "as well as" verb agreement