I would also suggested doing an official delivery of a reminder that their lease is expiring and the expected move out date and process.

With many people working from home, it isn't uncommon to require tenants to be available for repairmen or appliance deliveries.

If Tenant Defaults under this Lease, Landlord may exercise all rights and remedies available under applicable law, including the right to: (i) terminate this Lease; (ii) regain possession of the Property through an eviction or similar process; (iii) recover from Tenant all unpaid Rent, including unpaid Monthly Rent, Additional Rent, Late Fees and, if applicable, holdover Rent for the period prior to Tenant’s delivery of possession of the Property to Landlord; (iv) recover all Rent payable under this Lease for the period from the date of termination for Tenant Default through the stated Expiration Date, less the amount Landlord is able to collect from any replacement tenants for that period; and (v) recover allreasonable costs and expenses incurred by Landlord in repairing any damage to the Property, caused by the improper useby any Occupant or any guests of an Occupant, less any amounts obtained from the Security Deposit.

Now on top of that there is material deliveries that are in concert to this. 

Since you've reached out to them multiple times with no response, I would send them - by email and mail with delivery confirmation required - a notice that you are cancelling the lease at lease end.

You might want to think about pulling up the carpet and taking a look. (2) Maybe the water delivery piping under the floor, hot or cold, has developed a pinhole leak and is spraying onto the subfloor from below. 

We are at a critical point for delivery in June / July of this year.

There are another 6,000 units in the planning stage for that same delivery window.

The appliance guy can't stop saying "sweetie" and "hon" to you when scheduling the delivery time.

Amazon just launched its first drone delivery and plans on creating grocery stores without checkout lines.So my question is, for those that invest in blue collar neighborhoods, does this concern you at all?