I know these lines of credit are typically variable rate and interest only but when I am buying deals with 20-25% equity that are new construction and cashflow around $500/mo with this loan option, I feel like I have hedged against those risks fairly well.

Also, there’s much to delve into on of those scenarios, like what type of cashflow or investment do you want, etc. residential, multi-res, small multi-res, commercial, industrial, etc.There seems to be fewer deals around these days and this typically benefits the more experienced and skilled investors but there are always multiple investors that get “tripped-up” in these markets due to them relying on recent “fortunate” market circumstances only to realize the markets cycle and they weren’t prepared or didn’t underwrite properly to account for unforeseen potential.There are more considerations, but this is a start.

Thank you Nick - unfortunately it is the name of the game in this space that there will be people with bad experiences, typically when the appraised value doesn't come in as what they expect and they lash out at the lender accordingly (anyone in this space obviously understands this occurrence). 

There are tons of threads here on BiggerPockets where you have a new investor bashing a property manager, seller or turnkey guy and then when the experienced investors chime in it becomes very clear that the new investor wasn't telling the whole story and there typically wasn't any wrongdoing by the property manager, seller, turnkey guy or what have you.

In that case, you’d typically need to file a legal challenge, which could involve going to court and showing that the restriction is unnecessary or unreasonable.The best advice I can give would be to consult a real estate attorney to understand your specific situation and options.

Issues 1) even garage conversion ADUs in single family zoned areas typically cost more to build than the value that they add.  

Typically I see it on anything over 5 acres. 

So, a house that would typically cost $100 per sq. ft. to build 5 years ago, is now costing $200 per sq. ft. 

Closing costs typically range from 2 to 5 percent of the total loan amount, and they include fees for the appraisal, title insurance and origination and underwriting of the loan.”When it comes to closing costs, a trusted lender can guide you through specifics and answer any questions you may have.

@Richard Benjamin WilhiteSince you inherited the land, I believe your cost basis is typically the land's fair market value at the time of inheritance.