According to Form 1065 instruction, who must file, "Who Must File Domestic Partnerships Except as provided below, every domestic partnership must file Form 1065, unless it neither receives income nor incurs any expenditures treated as deductions or credits for federal income tax purposes. Entities formed as LLCs that are classified as partnerships for federal income tax purposes have the same filing requirements as domestic partnerships."
Therefore, technically speaking, this LLC does not need to file tax return for 2015. However, there are several points you may want to further consider,
1) What do you mean by "The LLC satisfies all criteria under 6. on the 1065".
2) Make sure to see who owns the title of the real estate note. This title is which tax return(s) need to be filed under. Please make sure that no individuals' names on the title.
3) If LLC has filed tax returns prior to 2015, e.g., it filed in 2014. Then, it probably should have filed for 2015 with all 0s.
4) If we file the Form 1065 2015 return, without the proper extension, we may owe late filing penalty for this late filing tax return.
Fiona Chen, MPA, Ph.D., CPA, ABV, CFF, CITP