Ask the client for all the documentation for the LLC - Articles of Organization, SS-4 letter, etc

those documents will help you understand what the LLC filing requirements will be  - 1040 or 1065

Answer for Q 2)  27.5yr is Residential Rental Real Estate      does that apply to this property ?

Answer for Q 3)  Is IRS expecting a F1065 return from this LLC ...... you need the LLC documents                                         possibly you will need to file a return with $0 activity