If depreciation will be taxed upon sale, why do GP's look to accelerate depreciation through cost segregation.

One thing I would point out is that 47720, 47725, 47710 and 47711, 47715 in general (especially harmony way, we’ve sold quite a few in that area and it has been HOT forever) your cap rates you’re able to acquire for will be lower in those areas as appreciation typically happens at an accelerated rate in those areas due to the demand to be in attendance in those schools. 47713 is slower and can lack appreciation in a given year depending on the area and 47714 (being the largest zip we have here by parcel count) really depends on the area you’re buying in.

Of course, over time you'll pay more and more principal, but it really doesn't start to accelerate until 5-7 years in, on a standard 30 year mortgage.Whether to buy now is your personal decision. 

The HELOC funds can serve as your down payment AND a vehicle to massively accelerate mortgage paydown (and even paying off the truck) on the new STR property.

They'll do a cost segregation study for accelerated depreciation.The Short-Term Rental (for only three nights) creates a significant loss for 2022 that can offset their W2 taxes. 

If you don't, the lender most likely has the right to accelerate your loan payments, however if you are paying your loan they never do.

While this is a violation of the covenants of the deed of trust or mortgage instrument, and theoretically (if the note holder becomes aware) the note holder can accelerate (demand full payment) of the note, in practice this rarely happens.However, there are risks for both the buyer and seller in a subject to transaction.  

The lender needs to understand cost segregations / accelerated depreciation on our tax returns.

You'll accelerate with multi-family, but you can also do well with SFH, STR, commercial, storage, or even vacant land.

If so, this would just accelerate depreciation significantly reducing your taxable income while only costing you the price of the cost seg study.