I’ve been getting some conflicting information with regards to the Refi aspect of the BRRRR method on these 1-4 unit properties.

@Jake Keating ,It is actually better to inherit the house after they pass because you will get a Step-up basis in the house.

I want to start by flipping single family houses using hard money to generate cash for more flips and multifamily rentals, but am unsure the next step I should take.Should I start calling hard money guys in my area (Denver, Colorado) to see how much I could get, or Find a deal and then call them? 

Some methods of finding deals fit better depending on how many you want to find.

*measure the rooms and start prepping material orders* invite contractors over to bid on items and get them scheduled for as soon as you closeContractors are usually the long pole in scheduling, so getting them in and tentatively contracted is a HUGE step forward.

Remember that every step is a learning step and you won't always hit homeruns.

What’s the first step?

You get to lock a price, step in and improve the property and then buy at the locked price.That said, it's up to you to decide if the market you're buying at is an up-trending market or not.

If you hold your Opportunity Fund investment for at least 5 years, you can step up your initial cost basis and reduce your capital gains tax liability by 10%.

You've shown you are open to treating for rodents and you've taken reasonable steps to resolve the situation since they've only been noted outside the unit.