I hope these responses provide enough insight to direct me to investigate a few directions.

Certainly worth investigating closer

After a bit of investigation i found what I guessed was the current address of the owner.

In the past, I hired a private investigator to locate this information for me.  

@John Barr Thank you for your investigation, What is the price range of the properties in these zip codes?

Additionally, upon further investigation, it was revealed that the valleys underlying the tile roof are in need of repair and/or replacement soon. 

I think it's right, but will investigate if there's room. 

Investigating complaints is their job.

HOA boards love to spend lots of time picking paint colors and reviewing plans for adherence to design pallets, and they tend to be slow, which is always the enemy of builders/developers.Also:1. check city/municipality zoning for your parcels and the surrounding parcels, make sure triplex (attached residential) is allowed. 2. research should include investigation of front, rear, and side setback, units per area of land (i.e. one unit for every xxxx s.f. of land), and how many units per parcel (sometimes zones only allow x units per legal parcel), and parking requirements (with multiple units you may need to provide guest spaces). 3. keep in mind when you go to sell how attractive the units are to potential buyers.

@Joe Homs btw good luck with your current investigation, and if I can help in anyway please let me know.