Make sure the note has a an agreeable extension option to prevent putting yourself in a bad position if things take longer than anticipated.

I'm guessing that part of it is due to the Régie du logement preventing rents from going up too much. 

Filing a notice of an option is an encumbrance, it's a lien that clouds title, it doesn't prevent a future sale, just as a property can be sold subject to that lien, a sewer bill, tax bill, mortgage, workman's lien or whatever, the buyer takes title subject to the lien interests held by that lien holder.

So I'm always at a loss for what to do with stairs.I normally use the metal stair edging for stairs that aren't showy: Leading to basements, etc because I feel that is best for slip/trip prevention, but I really like the look of stained (or painted dark brown) Treads with white risers, especially when there is no other carpet in house.Wooden stairs are less slip resistant compared to carpet or metal edging: fine for my house, but I worry more about slips/trips at a rental.Does anybody have any decent looking solutions?  

The LLC protection may prevent you from losing it.

I definitely see the value in having someone more experienced help out in the whole process.I hope to prevent any lack of knowledge situations by reading as much as possible and asking questions..

But outside of that, I don't think a stabbing in the unit is going to prevent too many people - other than the person that got stabbed obviously - from renting there given that the person didn't even die.  

@L'aura BradfordBanks don't like it & further, go out of their way to prevent a buyer to tie up a property & then assign the contract to someone else. 

How could one prevent a stolen deal?

That way they will likely keep the property up and pay, but if they don't they will be reasonable with a plan to move them out to prevent negative history on their background while you can get possession of the property back quickly to re-rent it.