Wrongful termination of lease

Hello,
I am seeking some information or advice about a problem that I am aware of...
Three tenants moved into a new apartment last November and their lease has run out. The problem is this: according to lease, the property owners did not notify them in time of his intent to not renew their lease. It clearly states in the lease that tenants will be notified no later than June 15th that they will not have the option to renew. The owner did not notify the tenants until almost July of his decision to not renew. In addition, there have been various problem within the apartment such as exposed wires from construction, unfinished bathrooms and hot water issues.
What I am wondering is if there is anything that the tenants can do about this to either extend their lease or recieve damages? It does not seem right what is being done to them and I would like to know what can be done on theri behalf and if there are any penalties for landlords in a case such as this.

Thanks so much for your help, I am really looking forward to hearing your thoughts.

In most states if a new lease is not signed the tenancy becomes a month to month tenancy. Of course this specifically depends on the state that you are in.

Has landlord given sufficient time to move, Such as 30 days notice?

As for the problems...Are they documented through letters? This probably won't fly as a judge will ask why tenants stayed in the first place if there were all these problems going on. It is tough to sue for damages after tenancy is over as it looks like it is retalitory.

Most states allow a repair and deduct approach. For example say in January friends complained about exposed wire. This was a danger to children. Tenants gave ample time for landlord to fix. Landlord refused and tenant hired someone to fix issue and deducted from rent.