I sent email notification to all tenants the following day saying that this is unacceptable behavior since it can potentially cause a fire and carbon monoxide poisoning.  

However, anything that impacts functionality like plumbing, HVAC, or safety issues should be handled before listing to avoid turning off potential renters/buyers.If you’re re planning to lease it, tenants will expect everything to be move-in ready before signing.

I'm considering tapping into the equity from either my primary residence or rental property to purchase another rental home that generates solid monthly cash flow.I'm open to investing out of state and have heard that areas like Ohio, Tennessee, Georgia, and North Carolina offer potential opportunities.

You can still find positive cash flow (aka the 1% rule) and amazing appreciation potential.

Definitely a good overall real estate market with solid upside potential. 

If I can park the 388k ($415-27k) for one year at CD rate of 4.5% and then est 300k (after paying cap gain/depr recap) at 3.0% (assume CD rates lower) that interest income of about 24 months net of ordinary income tax is about the same as my current mortgage.Trying to play devil's advocate and think why selling this year does not make sense. 

If someone stays at a property for 14 consecutive days or more, they could potentially be considered a tenant under state law, even if their stay is structured as short-term renewals.If the individual is classified as a tenant, landlord-tenant laws would apply, meaning you may need to follow formal eviction procedures to remove them.

My GC and I are visiting a property at 10 AM tomorrow that we are looking to potentially flip, however my concern is that there is only “street parking”, no driveway.

This can potentially lead to problems and the safety of the others in the home.I am planning on speaking with him about the lease violations and switching him from yearly to monthly with an increase in rent, due to the increased labor of the cat and the checks in of the cleanliness of the room. 

If you plan to use the remaining HELOC for a DSCR or BRRR strategy, that could help you build more equity, but consider if the current market conditions will lead to higher rates and lower cash flow in the near term.If your goal is to scale, you might consider holding onto your current duplex for the cash flow and focusing on the BRRR/DSCR strategy, which can allow for more control and potentially better long-term returns.