Pipe penetrations are another way that sound can leak between units. 

Check for signs of moisture and enlist the tenant, too.Abnormal use: My abnormal use examples are not just having friends do laundry or washing cars but more like someone's kid leaving a faucet or hose on--all day, day after day...

There is evidence of past moisture on the ceiling in the kitchen.

In a kitchen prefinished hardwoods, I think you have the possibility of moisture between boards with spills.

Has anyone decided not to invest in these properties due to concern around moisture penetration? 

Sprayed OdorXit won't penetrate the soil adequately to reach the depths that the urine saturated.

----------For our tenants, we provide a move-in packet that contains these enclosures: Welcome letterRental Agreement, Property RulesLead-based Paint Notice & Information BookletMold/Moisture Notice & Information BookletMove-In/Move-Out Inspection ChecklistUtility Transfer AgreementMaintenance & Repair Request FormFire Safety BookletEmergency Preparedness BrochureRecycling/Waste BrochureUS Postal Service PacketEnd of Tenancy Move-Out InstructionsWe're in the process of creating an Orientation Notebook for each property that would contain information on use and care for the home.

We ordered a router bit so we can start cleaning up the reclaimed flooring that needs its edges cleaned up a little.We're replacing the sheathing in the garage that was rotted because of moisture damage around the chimney.

Tenant shall use reasonable efforts to maintain the dwelling unit and any other part of the premises that he occupies in such a condition as to prevent accumulation of moisture and the growth of mold, and to promptly notify Landlord in writing of any moisture accumulation that occurs or of any visible evidence of mold discovered by Tenant.DISCLOSURES: Tenant acknowledges receipt of the following documents: EPA’s A Brief Guide to Mold, Moisture, and Your Home (PDF format may have been emailed instead of actual paper pamphlet)

If you smell a damp musty smell there is a moisture issue.