The 3 day notice will suffice. 

Or would the 60 day notice (from today that would be April 19th) suffice? 

Will I have to personally guarantee the mortgage or will the house suffice as collateral for the bank?

Does anyone have a confirmation form they use for this situation, or would a confirmatory letter setting out what has happened suffice, or what would you do to firm up this move out date and avoid some sort of situation where she decides she's not breaking the lease after all?

If the properties are bought via seller financing, I’d like to protect both buyer and seller, would a title company suffice or should I absolutely have an additional lawyer involved? 

She's asked me not to share the location of the property, suffice to say its in Northern NJ, near the NJ transit lines.

@Allison Stewart if that worried about it one can use the same fields build the exact same structure in MS Word and just remove the header stating TAR and must be agent part...you could even just copy it into paint and remove the header and that would suffice.

I haven’t counted the parking spots but I would say it’s suffice for the complex .

We need recommendations on the best way to tackle this project, do we need to hire a structural engineer or will an architect suffice (if needed typical price? 

There are other methods I will not explain in detail, but suffice it to say all others are inferior in terms of credibility.