In addition, of course to location (proximlty to all the attractions), size, age, service, amenities ..In October 2016, I used my HELOC to buy a long term rental property in Palm Bay, FL which is currently leased out (yearly) starting March 2017 (and renewed last month).

It's my understanding that in PA a yearly lease that is not renewed would revert to MTM.

The seller did express he was reluctant to not renew lease for fear of tenants trashing house. 

Here in Canada, both commercial and residential mortgage have terms less than 10yrs ... the most common being 5-years, so "balloons" and renewals are the norm.As Omar indicated your primary concern should be running your business as efficiently as you can and maximizing the revenue stream.    

They also stated that they only need it for 1 to 2 months which will be right in the middle of our trip (this is why we offered a minimum of a 4 month lease renewal). 

I cannot remember the length of time- it's a year or 2 I think to activate, but by then you'll have to renew with DBPR, so better to wait until you have tentative plans to move down and already have a brokerage selected.

This Agreement is entered into by the parties hereto for not less than twelve (12) months andautomatically renews for up to 10 twelve-month periods on each yearly anniversary date.

For the lease I'd do short term only; a year at the most, renew it if needed.

The amount they are paying should be included in your underwriting for the current year and the next 13 years (including the new 10 year option to renew).

Tenant shall provide a certificate of insurance to Landlord demonstrating that Tenant has procured the required insurance coverage, within ten (10) days after the commencement of the Term of this Lease and within ten (10) days after any renewal or change in such insurance coverage.