If you're confident you can add another apt through the two empties, factor it into the exit income projections but dont forget to add the rehab cost to your cost basis projection so can calculate your return on cost basis.

I understand that the majority of the risk in Section 8 is from tenants damaging the property, therefore depreciating the asset over time and leading to high maintenance costs.

If you invest in San Diego I suggest using a cap expense cost of $300/month for SFR.  

This will allow you to spread out the costs of the renos and minimize the vacancies.

Converting the sunroom into a bedroom would cost 4k-5k. 

Protect any current investors at all costs.

The average single-family home may cost $10,000 and that's a new install.

First, all first flips take 2-3x as long as you think and cost 2-3x as much as you think.

One of my properties cost me a little more, but the other two were less than what I was paying with foremost insurance.

Intel is a great example, who is building the largest chip manufacturing plant in the US right here, and it will be a $20 billion dollar investment that brings a few new thousand jobs.https://www.dispatch.com/story/business/2022/01/21/intel-ohio-building-computer-chip-factories-licking-county-jersey-township/9173472002/ Another example of economic growth is the upcoming Ohio State University Wexner Medical Center Inpatient Hospital which is a 1.9million square foot hospital that will bring over 800 new beds and a thousand new jobs. https://abc6onyourside.com/news/local/new-osu-hospital-expected-to-transform-health-careHere are a few more recent investments https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbus Check out The Complete Guide to the Columbus, Ohio Real Estate Market which goes through the Columbus, Ohio market in depth and will give you a better scope of where the highest levels of growth are taking place and where to look to invest.