Doesn't exist in Canada.

Are there any rules, laws, or regulations regarding this?

To get to the ARV of $250,000 , I am assuming as follow:Because you spent $15,000 in renovation, I am assuming you increased the Initial value of the property at 30,000 bringing it at $230,000Add a 8.69% home appreciation for one year $20,000Estimated Home Value After 1 Year:$250,000Refinancing Breakdown:New Home Value (Post-Appreciation): $250,000 New Mortgage Amount (80% LTV): $200,000 Existing Mortgage Balance after 12 months: -$158,035 Assuming 3 Months Interest Penalty for Breaking Existing Mortgage: - $2371Total Cash Pulled Out: $39,594, allowing you to recover to pay a portion of your initial investment of $63,548, leaving $ $24,015 in the deal.Many new investors mistakenly believe the BRRRR strategy ends after the cash-out.

@Jonathan Greene @Jay Hinrichs @Nicholas L.Note: Each state has their own way of handling and regulating foreclosures, and as someone who is not specializing in foreclosures I can give you only general ideas and information. 

Do you happen to know if existing traditional IRA funds from outside of a business that I own can be transferred inside of a Solo 401K plan?

SFHs are largely exempt from many regulations such as rent control.

I recently looked at an existing STR, but either the seller did not track the expenses or they did not want to provide them. 

Equity first comes in the form of down-payment, but you can also force it into existence with rehab or wait for it with appreciation.This is why it is so important that you re-invest your cash flow into more equity.

Bacon is more yummy than a Christmas tree, but I bet I'm going to have a whole lot less regulation growing Christmas trees... however, before we even get to that, it's necessary to know that the inquiry is even about bacon v Christmas trees, rather than Bacon v grapes. 

Big cities tend to have more regulations, more crime, more leftist-leaning policies that hurt investors and private property rights, etc.