I’ve sold 13 properties on terms.

The investor should consider what his long-term strategy is - are you going to live there for 5 years then sell, for instance?

It's advisable to consult with experienced real estate professionals and conduct detailed market research before making any investment decisions.

We have a call schedule next week to go through in further detail.

If they continue to smoke in the apartment, you have grounds to file for eviction due to them breaking the terms of the lease.

We have been contemplating our strategy to start our business by having my sister buy her first home locally here in Connecticut, a duplex as her primary residence and live in one unit with our mother, while renting out the other unit to a resident, and be able to also rent out her single-family house as a short term/midterm rental to traveling nursers/working professionals on furnish finder.

You might also be a good candidate for a small boutique hotel, an operator looking to retire will often entertain seller financing on fair terms and you could likely qualify for a SBA loan to help with your vision. 

Is there a standard letter that I need to send tenants a month before the end of their lease to remind them to move out by the end of the term?

So it is a good long term bet (provided the socialists do not bankrupt you first).

It might be easier to treat it as a full scenario with Purchase price, Down payment, Term, Prorgam, occupany, number of units/rents per door, Taxes/Insurance (Any flood, HOA) etc.