While reading the BRRRR book, I became confused on the financing aspect of the process.

I was told by the Trustee, I could finance the condo instead of buying it with all cash.However, since this is auction property and doesn't allow someone to do inspection from inside most of the lender are suggesting that get a hard money loan instead of conventional investment loan.hard money loans are expensive (12% to 13% + origination fees).Does anyone has done this before with conventional investment loan where you don't do the inside appraisal.or any recommendations for lender who can help achieve this?

I’ve never had someone turn down a financed offer and push for bond for deed. 

Find lender/financing

I work in the financing space - there can be a lot of ways to buy.

How would most sellers react to a 3-4% interest rate?

Oftentimes when municipalities ban STRs they will grandfather in existing operators, but if you are mid build when they do that you’re screwed  Once you’ve identified a list of “safe” markets, compare them on Airdna to see where you can likely charge the most (I’m assuming building costs will be more or less similar, so you might as well pick the area where you can earn more revenue)Also, in this market you may be able to pick up land with seller financing instead of having to buy in cash or traditional financing … potentially low or no money down, and won’t affect your personal DTI.

These things are the foundation for BRRRR, cash-out financing, and other REI strategies.

It depends on what your starting reserves are, but if you have enough for a down payment, I would look into DSCR loans for financing, as you can qualify based on the property's cash flow as opposed to your own personal income. 

I wrote about this weeks ago and the potential impacts it could have on real estate investors and financing.