you have to learn land entitlement. we identified a site today for hotel development that was an 18000 sq ft lot.

As there is a general flight to affordability, the new developments don't fill as quickly, and rely on concessions and/or lower asking rents to fill up.  

I am considering working with a property developer in NJ to buy land, build a duplex/triplex and sell it (6-9 month time horizon).  

In Columbus, you can still find the 1% rule and there's amazing appreciation potential due to how much population growth, job growth, and companies moving/developing there (recently Anduril just announced another 4,000 jobs coming to Columbus Ohio on top of Intel, Google, Amazon, FB, Nationwide, Ohio State University, etc.).

very high risk even I only do them with very specific investors in mind and a plan. we dont flip land we develop every one. 

I do use ChatGPT to help me develop my spreadsheet.

Purchase price: $75,000 Cash invested: $600,000 Sale price: $269,000This is my largest new build development to date.

Do you do any development projects? 

I am curious at what stage of land development the sale was struck with builder.  

Most take near a year in southern Ca, but you hear of exceptions in both directions on that timeline.What some developers are doing here is leveraging the affordability issue and getting permission to build additional ADUs by designating some as affordable or semi affordable units.