Your question(s) and facts are not consistent.
1) You indicate that the member's own the property outside of the partnership. Why are you asking about contributions?
2) I think you are making this more complicated than it is. Not sure why you have an LLP?
3) Just file an extension for the LLP
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
