Since new builds require upfront capital, you might not see immediate returns, but lower maintenance costs and higher rents typically make up for it long term.If you're serious about scaling with BTR, make sure you connect with experienced builders, property managers, and lenders who understand the strategy.

.$300k mortgage at 7.25% (30-year): $2,046$300k mortgage at 7.6% (40-year): $1,996Technically, it lowers the monthly, but not by much once factoring in the rate adjustment.

You would then weigh out a lower closing price due to the bitcoins and then you would use the lower price as the principal for the loan. 

Baselane also lowered their APY, which I get, but in the end, it was worth it to me to pay for Stessa Pro for the added beneifts.

If they have a good interest rate it might be worth looking to see if you could assume their loan to take advantage of the lower rate.  

Their ability to recover their money should you default is much lower in this position.

This active income can help me fund my retirement as well as help me get reimbursement for home office and health care premium while lower my tax liability.

You may think about buying a SFH instead of multi-family if you're working with a lower price point.

There is a ton of fix and flip going on in Brooklyn and I am trying to work my confidence towards that after my first project at a lower price point around 300K somewhere (CT seems like my only option). 

You are competing against other owners who have a much lower basis and/or debt cost to cover.