The move comes as Philadelphia enters a new phase in its efforts to be chosen by Amazon as the site for the new central office, nicknamed "HQ2," to support growth beyond what its native Seattle can accommodate. The city earlier this month was named among the 20 sites to make it through the e-commerce behemoth's first stage of vetting for the new complex, where it plans to invest $5 billion and employ as many as 50,000 people.