Here in the east, with heat waves and humidity, it is common for most air conditioners to cool down between 10-20 degrees below the ambient air outside.

I can't see much from the photos, but those window unit air conditioners don't help the building.

Since 2006, I replaced all three bathrooms in the house, refinished the hardwoods, rugs, hot water heater, air conditioner, added pavers in the rear patio, replaced all windows and the list goes on and on as I’m sure everyone can imagine.

I know of one of my investors friends that had an air conditioner 2" over the property line and the people who bought the vacant lot next to him caused him so much trouble over the 2" easement he ended up selling the property. 

Turns out- the cat used the air vents as it's relieving stations, (the air conditioner was now part of the problem) as well as at the base of the staircase, and the wood trim was saturated as well.

Once we got new water heater, new furnace, new air conditioner, and were ready to rent, we (the property manager and I) realized that the copper wire had been vandalized as well.  

@Glenn Primack, having too much cash buildup is certainly one of the better problems to have with your business.Upgrades can be from a mild aesthetic upgrades (refresh paint on the trim / light posts / mailboxes), more expensive renovations (landscaping, new garage doors, new air conditioners in units that need them), or major projects.  

They had some ideological goals and that suited them.I know we rent out a house in which we replaced an old boiler and air conditioner and cut energy use by about half and the biggest results we've got to show for it are much lower maintenance bills from the new equipment and stable renters that turn over infrequently.

Meanwhile they forget about little things like roof replacement, vacancies, water heaters that burn out, failed air conditioners (granted, that one isn't a big deal in the Northwest ;-), etc. 3) I learned that buying "Subject To", or using Wraps or Lease Options and selling to Tenant Buyers who give me a substantial down payment and who maintain the property provide the easiest entry, highest return and least risk.

I paid $3,300 for furnace/air conditioner (excluding duct work).