I have heard it is 50/50 but have also seen that people are supposed to make the measurement of deductions based on square footage.  

I'd recommend you pick up "what every real estate investor needs to know about cash flow...and 36 other key financial measures", by Frank Gallinelli.

Nicest rehab in a class B- neighbood with an alcove 48" walk in shower (disregard the measurement on the photo below) on the 3rd floor unit in Chicago (proper).1) Would you install a glass door or curtain rod?

What measurements do I need to take with me to home depot?

I highly recommend reading this book to better understand various financial terms:What Every Real Estate Investor Needs to Know About Cash Flow...And 36 Other Key FInancial Measures

Security measures should be considered along with the potential profits and actual value of a unit.

In North Dakota, there is a measure that is trying to abolish property taxes and I was just curious as to what everybody's thoughts are regarding this topic.

I believe you can measure, but not quantify, anything.

You can take the measurement and fax it over to a few stone companies to give you the best price and also ask if they have some stone they are trying to get rid of.The edge will change the price also you can stay square to keep cost down, alot of times they will have slabs were the clients don't want or sample or bad cut and you can get them from a mark down.

That is also a great idea, I could see it being especially helpful in multi-unit buildings where you can measure satisfaction on a collective level.I have also heard of landlords asking for the top 3 things tenants would like to see improved.