If of course, your life and personal situation complies :) I have done this for three years now.For this thought exercise, let's assume the RE professional requirement has been met, and that the net rental income (excluding depreciation) equals $0.Isn't 100K of gross taxable income less 30K of depreciation equal to 70K of taxable income (i.e., 100K-30K=70K)? 

Senior can exercise its business judgment on the timing to foreclose if there is a default.

A tenant may not exercise remedies in this subsection if the fire or casualty damage was caused by the deliberate or negligent act or omission of the tenant, a member of his family or a person on the premises with his consent.

A landlord has a duty to exercise reasonable care to guard against foreseeable dangers arising from use of portions of the rental property over which the landlord retains control.

In Florida if somebody bought the tax certs from 2015, 2016 and 2017 can they take/buy/exercise/get title to the property?  

If you have a responsible tenant that wants to save a little on rent, then they can do it and some are motivated to do so to save the money, I know I would be and enjoy the exercise.

Active participation simply refers to the amount of management oversight you exercise and serves as a qualifier for taking the net passive loss allowance.  

NOTICE: If Landlord fails to repair a condition that materially affects the physical health or safety of an ordinary tenant as required by this lease or the Property Code, Tenant may be entitled to exercise remedies under §92.056 and §92.0561 of the Property Code.span>If Tenant follows the procedures under those sections, the following remedies may be available to Tenant: (1) terminate the lease and obtain an appropriate refund under §92.056(f); (2) have the condition repaired or remedied according to §92.0561; (3) deduct from the rent the cost of the repair or remedy according to §92.0561; and (4) obtain judicial remedies according to §92.0563.

What about locking it up with a purchase option, finish it enough to qualify, then exercise the option and purchase with conventional financing?

They are a great if you do any commuting or while exercising.