Building LLC Credit Score

[Laleh Omaraie]

I just started an LLC in order to get a DSCR loan for - hopefully - a future STR (the LLC was required in this particular situation). I want to get started on building business credit. I was denied for an unsecured card (my personal credit is great but I think they didn't like that I recently got a HELOC) but have the option of doing a secured card. I own my primary, which I house hack; it's under my personal name. What happens if I want to build business credit but don't close on an STR right away? What sort of costs, if any, can I charge to my business credit card so I can build credit?