I want to purchase a good quality car, near new (not brand new), so that I do not have to worry about buying another one for at least the duration of time I plan on aggressively investing to achieve about 12k a month in cash flow, over the next 12 years.

Same duration?

You get easily 5,25% with short duration bills that are highly liquid, without risk, and no tenant troubles.

There is a chance I have to live here for the duration of my lease, which ends August 31st.to help save cash, i'm considering doing a STR on my property for 2-3 months while i have moved my stuff there and live between my new home and my current apartment. 

Up the intensity until it sucks - progressive overload, faster time, better form, time under tension, longer duration, add'l sets, more reps, etc...

We are also getting a forgiving loan of 30k for the duration of 10 years from the county for 1 unit if we rent out the 1-bed basement unit to a household with income less than 100k and at the rate defined by the city )(~1183+ utilities) for a 1 bed unit.

If you are in a condo building look at Section 718.110(13), Florida Statutes, provides as follows: “An amendment prohibiting unit owners from renting their units or altering the duration of the rental term or specifying or limiting the number of times unit owners are entitled to rent their units during a specified period applies only to unit owners who consent to the amendment and unit owners who acquire title to their units after the effective date of that amendment.”

Is it possible to get a fix and flip loan for the duration of the remodel, 4-6 months, then refinance to dscr or some kind of residential loan in the 7% range on a 15 yr?

It needs to be intrinsic for a DSCR loan to qualify, or they penalize you with an excess add on fee and/or rate. .Secondly, an IO really only make sense if you're investing in a short-term duration. 

Does your renovation cost take into account carrying cost for the duration of the rehab?