How do investors currently invest in this market when interest rates are so high then?

That street is definitely in a transition phase and given the current market conditions in my opinion you would have to discount units in that building to a point where it wouldn't make sense as a STR.

Currently, we have seven renovations going on with three partners.

Long story short - you cant just take the current effective tax rate and apply it linearly to the new price - there are fixed and variable components of property taxes so it wont scale like that. 

Lenders will want to verify your income, debt, and credit whereas on a Hard Money loan, lenders will qualify you based on the deal itself and your experience.  

My husband and I don't currently live in the house, so no sharing haha. 

@Guillermo Kennedy, it's certainly possible to use the existing LLC as a joint venture entity; the legally binding agreement here would be amending the existing operating agreement and updating the current cap table to reflect the new members of the joint venture.

My income is a bit low but my business partner does have a solid income.

Currently offering 3 months free rent.

Do some shopping and find the carrier and agent that fits you in your current situation.