did you purchase it as an "investor" or as a "owner occupant"?

It would be better to get a contract on this one - usually 80-90% below market for condemned properties - they do a wholesale flip.Code Enforcement will have a file on the property which tell you exactly what needs to be done to get a certificate of occupancy again. 

Even worse idea for a fix and flip, and then the owner occupancy protections don't apply even... 

Watch "Hotel Impossible" on the Travel Channel to get an idea of the issues you will face.Like apartments, the idea is to find a property that has been mismanaged and has deferred maintenance that is charging below market rates with low occupancies in a fairly decent area with good market drivers.

What you need to do is immediately give a three day notice to cure or quit in regards to the dog and the unauthorised occupants.

I would say I understand you are upset and if you choose to leave the terms of the lease will hold unless... here I might leave the option that the fee is less if there is an immediate occupancy by someone else.

Do they typically work like an FHA loan where there is a minimum 1 year occupancy requirement?  

They will usually have seasoning requirements of 6 - 12 months of continuous occupation for rentals.Is it for a recently Rehabbed property (BRRRR strategy)?  

Check every month of the year on calendars and occupancy rates.

Since we already own a lot of properties, we work to partner with cheap and skilled tradespeople saving maintenance costs.We are proactive in our maintenance so our tenants are happier and they stay on average longer than most tenant occupancy periods (which saves the owner on future leasing).We set up leases to end during summer months where we have the most tenants looking for new houses to rent so we can maximize rental rates.Even though we rent fast, we prioritize make ready repairs so that we can continually keep the property up to maximize rental potential and identify and get great tenants.We are proactive in our collection of rent so we evict faster than self managing investors.We perform inspections to identify how tenants are keeping the property to not renew leases to hoarders and people who break lease terms.We perform move in and move out inspections by video to document condition to charge back tenants on security deposits.For some investors, they are not as on top of all aspects of property management and they should get help (to improve ROI).