There is a profit but not worth the risk.  

Here’s what you need to consider:1.Related-Party Restrictions•The IRS generally doesn’t allow 1031 exchanges when both the sale and purchase involve related parties, unless both properties are held for at least two years after the exchange.

I follow the letter of the law( no matter how much I may not like it) that's part of my risk management and my reputation.

Sometimes occupants still live there and eviction is not easy, and I have even heard a story once that the yakuza are involved in the construction and real estate business and exorted money from buyers through occupants in these properties. 

Per this NY Times article, the average American knows around 600 people.https://www.nytimes.com/2013/02/19/science/the-average-american-knows-how-many-people.html#:~:text=The%20average%20American%20knows%20about,do%20you%20know%20named%20Kevin%3FPer the US Census Bureau, the average American moves 11.7 time in their life, which based upon an approximate lifespan of 84 years, works out to be about every 7 years.https://www.census.gov/topics/population/migration/guidance/calculating-migration-expectancy.html#:~:text=Using%202007%20ACS%20data%2C%20it,one%20move%20per%20single%20yearSo, if the average American knows 600 people and they each move about every 7 years, that means that the average American knows around 85 people that move in any given year.How many of those moves do you want to be involved in?

I personally have no connections with anyone who is involved in this niche and I'm wondering how other people have started their journey.

And as I explained earlier, your investment is protected by real property, so your risk is extremely low. 

I recognize that commercial real estate is struggling, with ~30% vacancy in downtown Portland and homelessness issues, but I believe this property’s tenant stability and quality make it a lower-risk option. 

Reward: Assess whether the uncertainty surrounding the current occupants, title clarity, and liens aligns with your risk tolerance.

Buy a lot, build a rental propert, to be rented out 2026 for approximate annual income 150k.I understand I can borrow for 1 and (2 or 3), but that would put me under risk i don't want to take.