This is a highly polite and humble way to thank someone for coming to a specific location. The phrase uses "お越しいただく" (okoshi itadaku) which is honorific language for the listener and humble language for the speaker, showing deep respect. It's commonly used by hosts welcoming guests at events, shops, or homes.

お客様など、来てくれた人に対し、非常に丁寧に感謝を伝える言葉です。