There are so many facets to investing I would say it's near impossible to nail down one thing for everyone as a reason to buy or not to buy in a city.I have been fortunate to speak to many investors in other states and recently was a keynote speaker in Brisbane Australia on those subject..

Since most of my homes were built  in the 20's & 30's I always hang their pictures for them because you cant nail into the old lathe and plaster. 

glue/nails/etc?

Your hunting gun is now racked, stacked, and fully loaded ... ready for the next recession, coming soon to a market near you ... or if you decide your hunting days are over and you'd rather just sit on the front porch drinking a beer, polishing your hunting rifle, telling tall tales of hunting seasons past, and laughing at the newbies gearing up ... hey, you probably now have that option or will real soon. 

. - You nailed it...most commercial loans for beginners are going to have a ballon payment due after 5 years, with the actual loan schedule being paid off over either a 15, 20, or maybe 25 year amortization.

Personally, I have a master where every item is broken down into the 16 CSI Master Format divisions where I listed, down to the nails specs, every item you could ever need, and I sourced the prices from hardware stores and specialty stores.Then I had tables for items like: "wall framing" where I included all needed items from the first sheet leaving the qty at some nominal number like 10 feet.

@Chris Thomas @Matt Motil nailed it!

I would also look for popped nails, and and exposed nails on penetrations, where the sealant is gone away.

I still have some rough edges that need polishing.

It's usually just screws/nails that have gotten loose over the years.