What can I legally do to fight back a commercial landlord who discriminately declines us an option to renew?

They are NOT targeting you. They are getting rid of EVERYONE as soon as their leases are up, because they are legally required to honor the existing leases. NO state requires ANY landlord to renew leases. Any lose is an INHERENT risk of operating a business. You have NO claim. As it stands, you were given more notice than legally required. Find a new location BEFORE August.