I have found my first multi-unit property that I am going to make an offer on. 

For future readers, many banks will offer an unsecured line of credit up to $25k.

Hi @Alex Lee I would avoid 203K loan and work with conventional renovation loan based on knowing you'll be forced to use 203k certified contractors which will cost more money and offer inflated pricing because they must follow 203k guidelines. 

Pro Tip: Ask an insurance agent what your rate will be before you make that offer.

Maybe they are offering financing because no traditional lender will lend on the building. 

Here’s a quick overview of potential pros and cons, along with general advice on working with hard money lenders like them.Pros:Flexible Financing Options: Rehab Financial Group often specializes in real estate investing and provides hard money loans for BRRRR deals, which may be a good match for your needs.Quick Funding: Hard money lenders like Rehab Financial can sometimes offer quicker access to funds compared to traditional banks, which is important for BRRRR investors looking to move fast on properties.Cons:Higher Interest Rates: Hard money lenders usually charge higher interest rates than traditional financing sources.

There's a post right above mine from a lender... there's always a lender offering $$$ even when people can't afford it. 

I bought this property with a private interest free loan from a friend. the person i bought it from need cash fast so i offered them a low cash offer and they accepted.I had enough money saved up to rehab the house with my savings.

Would anyone be able to offer general advice to this approach? 

.: Quote from @Stepan Hedz: Phoenix, AZ, offers a young myriad of options for real estate investors, particularly in the distressed sectors.