Im also a Licensed Realtor in the State of Florida My first project we bought sixty acres over looking the Pacific/Gulf of Nicoya [web site removed].

Knowing this, I went to her and offered to give sixty days to vacate rather than thirty.

Oh, but to make things a little more nuanced, I might have the solution that I'd shoot for:When you close on this purchase, you're going to promise to move in within sixty days.That in theory gives you adequate time to fulfill your 12 month obligation on the last mortgage, and meet the 2 month deadline for the new one. 

Agree on your getting good cooperation from them for showings, have them give you sixty days notice, and advertise. 

Most people need to give a thirty day notice when moving, some people require a sixty day notice.

Manufactured homes damaged or destroyed by fire, acts of nature or other cause shall be replaced within sixty (60) days of the time of casualty or the non-conforming status shall be forfeited." 

Return of security deposit. (1) A landlord shall, within one month after thetermination of a lease or surrender and acceptance of the premises, whichever occurs last, returnto the tenant the full security deposit deposited with the landlord by the tenant, unless the leaseagreement specifies a longer period of time, but not to exceed sixty days. 

At a local meeting, one guy stated he did SIXTY flips last year.

@Atwan Kwan I doubt that if it went to court or mediation, that the apartment community would win, IF the tenant truly gave his sixty day written notice 

If I were you, I would work out a deal with the owner and agree to move out in sixty days providing she gives you whatever monies she still has prepaid.