Once the construction of the business building was far enough along (but no more than 180 days) that the price of the land and the amount of improvements you make on it are equal to the sale of your old investment property you take title to it and that would complete your 1031 exchange. 

As you purchase more, your net worth will go up more quickly than the savings in interest with the other option.

Yes 1k sqft is small but probably much better than living with family.

Cost to wait is maybe save couple grand on zoning attorney but could potentially make that up by earning some rent earlier (vs. unused space). 

The exact amount varies by lender but is usually around $5,000 or more.Recalculation: After you make the lump sum payment, your lender will recalculate your monthly payments based on the reduced principal balance.

I truly appreciate it.I completely understand that the economics of owning a multifamily property (like a duplex or triplex) can be much more favorable than a single-family home.

Get much more done in person than through  email or text just sayin.

His use case was a couple of unleveraged properties in southern CA one being in San Diego and the other in Riverside county.  

That's usually how it goes with lenders that struggle with spelling. 

I'm sure people would pay extra for some kind of "meal prep/private chef" type package in their living situation.You've got the right idea thought, but don't be afraid to reach...nothing wrong with dropping your price after a couple weeks if you don't get any interest.