If I was them, I would try to extract something from you for giving up the space, even if I wasn't actually using it.Marketing: Absolutely you will have to market.

Will that cause more trouble than just trying to extract whatever rent I can  and  then give the 30 day notice to vacate?

The trick is extracting it from them.

My goal is to extract most, if not all, my money from every investment property that I own so I have essentially transferred all of the risk to the lender while staying liquid.

This forum is a great place to do everything you said - network with experienced investors, study articles on RE investing, listen to the BP Podcast episodes and extract nuggets for your knowledge, purchase books, attend webinars, and more and more.

You will really learn a lot.And to suck up to Brandon Turner and Joshua Dorkin just a tad, they keep it light and just the right amount of humurous- all while extracting tons of great info from their guests.

None are great deals, though, because there are other parties extracting some of the profit out of the deal.

I would extract myself from this situation in whatever way I need to in order to get the tenants cool and cut my losses.Then I would proceed by finding a reputable HVAC contractor who does good work at reasonable prices, but understand that good work has costs.

$500,000 @ 6% = $30,000 in so called "earned" real estate commission to have a realtor list a property in the MLS and another realtor reading off the same Menu, bring a buyer and extract that much in Tax Free Home Equity?     

Value extracted via a refi can compensate for a lot of cash flow.