@Qiong Yang If one unit satisfies your reinvestment requirement to purchase at least as much as your net sale then any amount over that can be used for your primary residence. 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

But in your case, since that is also one of the higher balance loans, I might instead choose to focus on the lowest balance first, that being the 4.5% at $375K.

But you have to be there 10 years consistently after obtaining the proper residency and approved permits AND meet the annual donation requirements, THEN it will be reduced to 5%.However, after reviewing this again,I feel all the other details associated with Act 60 is not really worth my while.

The more frequent the turnover, the more time required and the corresponding higher cost.There are also market variables, dependent on the property location.So, you are basically correct with your theory:)

After months of seller trying to get a clear title, seller was not able to get the partial release from HUD unless all the proceeds went to the mortgage balance.

We have been in a housing recession (arg, 2022) with regard to inventory and we do require inventory to increase to the mean, to return to a more normal market.

It is not a requirement to invest in real estate, many people are successful starting without it and that was my point.

If you're now in Salt Lake City (or surrounding area), a house hack may not be the worst option, because you'll get favorable terms and require less down.

To me, there's no comparison when it comes to complexity and required involvement between the two.