If there are lease violations, mention them-you not having a key to access the unit WITH proper notice or in case of emergency is one of them.I'd also tell the tenant that they are clearly not happy there, so finding a new place is in their best interest as well and as they have several months, they should have lots of options.

Give them a 30-day notice of termination and follow through on it.3.

Alternatively, put it on the market and give the tenants notice keeping in mind that showing times will have to be done with 24 hours' notice to the tenants. 

Alternatively, put it on the market and give the tenants notice keeping in mind that showing times will have to be done with 24 hours' notice to the tenants.

We gave the current tenants a notice that we need them the evacuate in 30 days.

City recently did a building inspection and we noticed the tenant is smoking in the unit (cigarettes and marijuana), food waste everywhere leading to building pest issues, and there are 5 people living there now (3 adults and 2 kids).

More than 5 days late (or whatever your local laws consider late), give them notice. 

When I have inherited tenants, I have been most successful when I have provided longer non-renewal notices, like 60-90 days, and offered to assist with moving costs.

He browsed through the lease and recommended to use the 60 day notice clause in the lease to send a lease termination notice.

IRS CP2000 Notice: Why Real Estate Investors Need to Think State & FederalQuick story that could save you thousands in tax exposure...Had an investor client who received a CP2000 notice for unreported rental income.