Yes
Business returns for partnerships & LLC on Form 1065 are due by March 15 of each year. This is so the partners or members get the Schedule K-1 in time to file their personal returns by April 15. You may file an extension for the Form 1065 if needed. You may also file an extension for your personal return.
On a separate note - you may want to ask if you need to file a separate business return if the LLC is "just you and your spouse" You should be able to file the rental income on Schedule E as a disregarded entry and if applicable take advantage of the rental loss provision. It may be worth your time and money to talk to a local tax professional to discuss how to file. Please check my profile and then consider my advise. Good-luck
