What is the ruling on taking out a loan with 5% interest from a bank to establish a commercial project?

The bank mentioned is not an Islamic bank, and therefore its financing does not cease to be a usurious loan forbidden in Islam, even if it is allocated for projects or its interest is low. The legitimate solution is to seek an Islamic bank that can finance the project through Sharia-compliant modes such as Musharakah (partnership) or Murabahah (cost-plus financing).