One of these things that I've been thinking about is putting security cameras around the property (specifically in the driveway and front entrance area). 

Did you have to make a second private entrance or was it shared entryway effectively already there?

Concessions Based on ImpactAt $1,850/month (~$62/day), here’s what we’ve done in similar situations:Bathroom rehab:One bath at a time with at least one always functional → $25–$30/day credit while one is out of service.Deck replacement:If it blocks the main entrance or creates loud work-from-home disruption → $20–$25/day for those few days.Kitchen rehab:If the whole kitchen is down for several days, we’ve paid for 3–4 nights in a local hotel with kitchenette or given $40–$50/day credit.Most tenants appreciate fixed daily amounts—it feels fair and avoids negotiating every little inconvenience.3.

Then I created a small studio like apartment on a part of the third floor with its own entrance and beautiful balcony and rented that out.

This is all assuming the suite gets its own entrance.

Preferably more than one access side for entrances.  

It's located in a good area (near college) and is a 2500 SF 6 bedroom house, with a fully remodeled basement with a separate entrance.

Find an older person or couple in the neighborhood with an extra entrance room.  

A lot of people get creative with it by finding ways to create separate living spaces within a single-family home, like finishing a basement with its own entrance or setting up a small in-law suite.

Line up at least two options for each role before you need them.Smart tech: Invest in a smart lock you can reset remotely, and cameras at entrances.