While "non-refundable" is not illegal per se, if the lease was broken it is the responsibility of the landlord to mitigate the damages. 

Anything is an upgrade to that.

Try to get extra income Rent appliances washer/dryerOffer electronic payments for a feeif you rent SFH charge for lawn cutsoffer security systems per month rentaloffer electronic lock upgrades -no key needed

I'll have to upgrade soon before taking you up on that opportunity.

I am glad this discussion came up about properties in Baltimore.I know there are many great sounding sales online for properties in the Baltimore and I am sure they are getting their fair of interest from out of market buyers.Unfortunately, when you do site visits you will find that the particular areas are in war zone status and are not safe to walk in, much less invest.Personally I do not mind section 8 or low income renters but the problem currently in many Baltimore locations is not only renters not paying, but the tenants ripping out all of your fine upgrades to sell on the street. 

The house across the street of mine had the toilets broken and cement pored down the drains.

Those younger workers don't get broken in to basic jobs skills early.

How dated or "broken" does a bathroom have to be before you should invest in improving it?

upgrade current properties

Juxtapose that with the typical path of living in homes for 4-5 years and then upgrading (and having to sell to afford the upgrade).