Also your capital gain is lowered the more you bonus.If you are going to accelerate you need to really consider how much personal property there, how long you're going to hold it, any offsets available, alternative transaction structures like installment sales or even delaying it a year.Publication 5653 (6-2022) (irs.gov)It lists four more including the ones below.The detailed engineering cost estimate approach (or detailed estimate approach) is similar to the detailed cost approach.

Some people say that is not the 'fastest way' to gain wealth in RE is to highly leverage and go big.

After you do that get to 5 million dollars in real estate that is when everything really starts gaining traction and your wealth turns into a run away train. 

I gained one additional renter, adding $800 more monthly rent income, and we build approx $40-$50K of equity.

First thing I see is you're close to hitting the 2 years OO for a tax free sale on any gain...obviously you don't currently have any gain, but if you can wait it out then any future gains would be tax free...it gives you some wiggle room later. 

You make the mortgage payments on their behalf.Advantages:Full Ownership: You gain full legal title to the property while keeping the favorable 3.25% interest rate.Control: You have more control over the sale because you hold the deed.Simpler Resale: Since you hold title, you avoid the complications of a land contract when reselling, especially to FHA buyers.Risks:Due-on-Sale Clause: The lender could potentially enforce the due-on-sale clause if they find out you’ve taken title, though this is relatively rare in practice as long as payments are made.Higher Closing Costs: You would need to close formally and cover title, closing, and potentially transfer costs.3.

A property manager brought it to my attention, and I looked further into it.

My father would be willing to help us out in basically any way that he could, in exchange for modest monthly payments going forward, and is content limiting his capital gains exposure with the owner financing. 

Rent growth had the most gains in 2022, but 2024 has seen modest gains. 

I bought on a discount to gain equity day one.