Because it is a LLC, the Qualified Joint Venture option only applies to Community Property States ( a non-LLC can do it in all states).  So that does NOT apply to your situation, so you must file a Partnership return.

If "services" are provided, the goes on Schedule C.  If "services" are not provided, it goes on Schedule E.  For the determination of self employment tax (Schedule C versus Schedule E) does not matter if it short-term or long-term (although short term increases the likelihood that "services" might be provided).  If "services" are provided for the weddings but not for the other tenants, then you enter the wedding would go on Schedule C, and enter the business percentage on both of the Asset Entry Worksheets.

The default depreciation is 39 years.   If 80% of the rent is from the dwelling units (people living in it WITHOUT "services" being provided, rather than used for weddings or providing "services" to the tenants), it changes to 27.5 years.  If it qualifies for one length of depreciation one year, but changes to a different one the next year, well, that gets more annoying, but you have the option to keep using the longer depreciation period.