Not sure I understand what you're proposing, but consider several things as you move the puzzle pieces around...
A single member (or one owner) LLC is disregarded for income tax accounting purposes. E.g., if LLC2 is the single owner of LLC1, LLC1 is disregarded. If bb5909 is the single owner of LLC2, LLC2 is disregarded. Owning the interest in the real estate through LLCs, therefore, is "invisible" in your tax accounting.
Another thing to know: Income and deductions retain their character as they flow out of a partnership. So the rental income flowing out of the real estate partnership retains that character--continues to "taste" like rental income as it passes though to you.
If the partnership was actually an active trade or business, the individual partners would need to synchronize their pensions with the partnerships. This is controlled group of corporations stuff.
Finally, that 401(k) elective deferral limit is across all your pensions. E.g., if you work 10 places, you still across all ten employees get only the $18K or the $24K limit.