There are no specifically tailored visas that would offer long-term, business-related stay. You may check visa options at: https://www.evisa.gov.tr/en/ and https://www.mfa.gov.tr/general-information-about-turkish-visas.en.mfa. You do not need to have Turkish partners to incorporate businesses in Turkey. Foreigners are permitted to open almost any types of business. However, business investments do not offer an immigration status immediately, although work permit is an option and you may check details at: https://www.invest.gov.tr/en/investmentguide/pages/obtaining-a-work-permit.aspx. You may check for CBI options at: https://www.invest.gov.tr/en/investmentguide/pages/acquiring-property-and-citizenship.aspx Please note that the straightforward model would be a property investment for obtaining citizenship and then moving on for business investments as a citizen.
