Hey @Zack Rosenbaum,That's high but it also depends on what style of building it is, square footage, whether all units have two means of egress, etc.  

For example, a buyer putting 20% down on a $500k home would pay around $500k in interest over the life of a typical mortgage at current rate around 6.5%.

To protect the floor or more importantly the lower level ceiling in the case of a leak/overflow form the washer. 99% of them never do anything their entire life. i would have balked at a $500 estimate for that job.Ps.

As for books, here are my favorite rookie recommendations:Set for Life!

If the software is not simplifying your life or making you more accurate, you shouldn't use it.

Its becomes a lifestyle.You REALLY need to be into that "lifestyle" since I believe your rate is higher. 

I’m a bit of a nerd with an analytical streak, attempting to break out of my shell and be more social—so if you see me in real life, get ready for a nerd trying to be outgoing!

in to 5 years he would be set for life...

One of the things that is missed so much is that CapEx doesn't happen in real life the way it does in a spreadsheet.

After all PITI, utility, and services (lawncare and cleaning) costs I have $7,225.I set aside 25% of this for my maintenance fund.The remainder funds my lifestyle, wife has a Tesla, and quarterly vacations as well as business growth.In 2023 I am tracking to build 4 duplex units designed as room rentals funded in part from a recent land sale.