For example - some associations will limit your ability to rent, or they may say that you cant engage in STR activities, or any business related activities.

Accountant can jump in many months after purchase, engage as soon as you're ready but it doesn't hold up a purchase. 

Should I engage the ADU builder as soon as possible or wait until I actually purchase a MFH before starting those conversations?

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Engage in any transaction for the purpose of financial gain within California2.

The tenants trust me, the neighbors seem to like me, and I try to improve the area through civic engagement.

Most states, Utah included, require you to be licensed to engage in the managing of properties that are not your own. 

"(a) It is unlawful for a person or entity other than the transferor to engage in, promise to engage in, arrange, offer, promote, solicit, assist with, or carry out a foreclosure rescue transaction for financial gain or with the expectation of financial gain, unless prior to or at the time of transfer, the transferee pays the transferor at least fifty percent (50%) of the fair market value of the property as determined by a licensed appraiser.

But I desire to engage in the pre/foreclosure transactions.

We certainly understand that in order for us to ensure our properties are being taken care of we'll have to be actively engaged with our property managers.