@Tegan Lehman you can write a legally binding contract on the back of a napkin.

for me its being able to look at a deal on the back of a napkin and see if it merits more work .. like in 60 to 120 seconds.you get a feel for the macro stuff.. you should learn that skill so you can wade through the morass .. 

The back-of-the-napkin math is that for every 1% interest rates rise, a buyer loses roughly 10% of their purchasing power. 

Thank you @Theresa Harris, the previous leases were lackluster, there was nothing in the lease about smoking except keeping the place "premises clean, sanitary, and in good condition and to comply with all laws, ordinances, rules and regulations and directions of government authorities". 

Just back of the napkin, since the property was just renovated, for this example I would allocate a 30% expense ratio (although it can easily be much higher, especially since it's a relatively small property).

Can I threaten to move and have them carry expense since they are not providing a sanitary office?  

@Isiee Koch Rules like the 50% rule are for really quick back-of-the-napkin analysis.  

The appraiser is required to do a more detailed inspection to ensure that the property is safe, sanitary, and habitable.

Your analysis and back of the napkin will vary probably quite a bit depending on asset class, location, size etc.

At the commencement of your tenancy…The landlord (Us) will provide a home that is clean, sanitary, in good cosmetic shape, and in good working order.