Would I be better off scrapping that plan and doing something entirely different?

But flips seldom go exactly as planned.  

Hello, I am about to sell a property in the Bronx and plan on doing a 1031.

Syndications are EXTREMELY risky investments suitable only for highly-experienced accredited investors who can appreciate the risk both to their principal in the case of bad planning or a scam AND to having their capital locked up for 5 years+.

Do you think the curbless is worth the extra work and planning required?

Your approach and drive is impressive, and it's clear you have a solid plan in place for what you want to do.I'd love to connect and discuss potential collaboration opportunities.

For example, we discussed the interest rate, looking for good terms that fit with our long-term financial plan.

The California Fair Plan insurance is expensive and has subpar coverage.Thank you in advance!

You'll have to add it at lease renewal and you'll need to ensure that adding the water plus any other increases you are planning does not exceed any cap on rent increases in your jurisdiction. 

a plan to refinance our current mortgage as well as get a HELOC.