NJ is very tenant friendly state on the legal side.

As best as I can tell on both sites, the algorithm looks something like this:Cheapest price>least restrictions (cancellation, # of days minimum, etc)>Premier/Super host>Review Scores>Most discounts (weekly, last minute, etc)>Regular revisions

Also, make sure there aren't additional restrictions on the property condition, compared to a conventional loan. 

**NAHB Contracts**: The National Association of Home Builders (NAHB) offers a variety of detailed and standardized legal templates specifically designed for the residential construction industry2.

But the answer for everyone may differ.Here are the personal attributes I see in those able to achieve a higher than market ROI, enough higher to be able to “scale”.1- Knowledge of real estate principles, real estate law and real estate finance2- Minimum 3 -5 years full time, or near full time experience directly related to real estate investing3- Ability to utilize technology for increased efficiency, capacity, and accuracy4- Excellent hired legal counsel and excellent hired marketing help5- Established method(s) of obtaining consistently high QUALITY deal flow6- Ability to manage and choose people who are NOT employees: Attorneys, Appraisers, Mortgage Brokers, Real Estate Brokers, Title Companies, Surveyors, Marketing Specialists, Accountants, Contractors, Consultants, Property Managers7- A VERIFIABLE track record of success8- Ability to identify, analyze, and negotiate a deal that can be “worked” for “enhanced” ROI9- Some type of competitive advantage; for example for me it’s my ability to analyze and identify mortgage loans that are actually less risky than all other lenders believe (on the investing in debt side), and on the real property side it’s my ability to analyze”pull the trigger” with LESS information than other investors need,  combined with the ability to pay cash, or raise significant capital almost instantly as well as being able to obtain loans at the lowest prime customer bank rate with no recourse or personal liability.  

Weeks later, it was communicated to us that the underwriter wouldn’t accept the ones signed by only one of us – legally binding for LLCs – and required we send amended copies of leases signed by both of us.

Holding properties in an LLC (or other legal entity) can offer valuable protection for your personal assets, so I understand why you went that route.

I did that (posted the notice on the screen door and took pictures), however don't know if it's legally served. 

Hire a company/person that is solely a QI like @Dave Foster they do it every day and will keep you legal and on track. 

When you add up legal fees, lease fees, loss of rent, etc. it can add up.