Get inside if at all possible, even if that means crawling thru the unlocked window of a vacant (heavy emphasis on VACANT) property. 

What you need to look at is the mechanicals, the plumbing sewer line, the roof, windows, etc.. etc..

Search past threads on this, some mention a chemical, TDP.Also have all the vents mechanically cleaned/brushed.Ozone generator in there for a couple of days post cleanup.

@Alexis DalPont I had a general contractor recommended by my realtor but his team doesn't deal with mechanical systems.

Huge emphasis on the maybe part.Plus, new investors cannot get funding from financing institutions.

If there are no "mechanical issues," have the HVAC company run a Manual J calculation (many don't like doing it since its a bunch of calculations) to determine the property sizing of the heating and cooling system. 

What is your finance mechanism?  

I am an electrical engineer and work at a manufacturing company that designs and builds electronic circuit board assemblies and electro-mechanical assemblies.

Unfortunately, it seems that my email server mistakenly flagged it as spam, resulting in my inability to locate it until now.Nevertheless, I am genuinely interested in connecting with you and delving deeper into the intriguing concept of shared ownership of real estate, as well as gaining a comprehensive understanding of its mechanics and functionalities.

All of the sinks currently have broken or missing stopper mechanisms.