The overall tidiness of the units will also give you an impression of the management of the building (tenants tend to reflect management and maintenance level).2) Big things are your big ticket items... how's the foundation... are the shingles curling?

Hi there, on a cedar shingle sided house with a mix of old aluminum and wood framed windows, is it best to just measure and order from a place like home depot?  

I had it written that the shingles were to be loaded . (30 sq roof) he decided to save $300 and have them dropped on the driveway instead . (2 story house ) .

A roof is tough, but maybe a different shingle is a minimal upgrade and gives better ROI.

B) More properties more down time for example: if you had 12 properties (12 months) can we reasonably agree that theoretically every month you would have a turn-over; or another example if you 20 properties can we reasonably agree that every year you would be paying for a new roof on a 20year shingled roof.C) there will likely be a snow ball opportunity which will increase and/or speed up projections.

Look for deforming shingles, if many of them are starting to fishmouth, meaning they are rising in the middle of their edge that can be a sign of age.3.

Roofs:  shingles are rated for 25, 30 and 50 years, but rarely does one last that long in a market with extreme temps or hail storms.  

I once had a house that had 13 layers of shingles in one spot.

Creme/Tan with brown garage doors and brown shingle roofs? 

See if needs to be upgraded.6TH Check all windows.7th Roof look for lifting or sagging shingles