I acquired a 6 unit in South Shore in April, but we're having a tough time finding renters and filling vacant units.
How long does it usually take to fill a turned unit in your experience?  And what's the best strateg...

There's nothing that prevents you from getting your replacement property under contract before the sale of your old property, and that would certainly help with the identification period instead of starting your search after the fact.

Typically these short furnished leases have shorter termination periods and easier termination like a month to month so if you have a good month to month you are good.

My advice, coming from someone who primarily wholesales and purchases land from wholesalers, I would ask them for a longer due diligence period; 14 days is the standard.

Honestly, Figure is a very convenient option for people who need funds in 96 hours or less, but there are quite a few HELOC options that are 1-2% lower rate with 5-10 year draw periods out there. 

Both down and amort period are tight.  

Wholesalers can “come clean” and be transparent upfront by either (1) informing the seller that they will only close if they can find a buyer at a higher price or (2) enter into an option contract usually with an option fee commensurate with the option period. 

I personally use a platform that's a debt fund but works like a high yield savings returning 8% without minimum balances or holding periods. 

This is allowing us to only target 10,000 sellers over a 30-day period in order to get 2 - 5 deals consistently.Instead of targeting entire cities, I am targeting specific low density areas with high cash buyer activity.

Capital improvements (like a new roof) are also depreciated—often over 27.5 years unless a different recovery period applies.