I want to purchase my second property within 4-6 months of moving into my multifamily house hack, but looking for a guidance on the strategy to do so.

There are other submarkets of Columbus like upper Arlington that have higher like $500 per square foot but the purchases are tear downs at $200 per square foot so the real exit is $300 or so.

It seems that if you can find a good deal on the purchase price, are willing to do cosmetic updates (floors, painting, maybe a kitchen) you can get that 100-200/month cash flow.  

Purchase price: $220,000 Cash invested: $45,000 This is a 2 bedroom, 2.5 bathroom rental that I purchased.

Purchase price: $75,000 Cash invested: $600,000 Sale price: $269,000This is my largest new build development to date.

Who owns the solar panels and what's my liability if I continue with the purchase?

First, congratulations on purchasing your first property together.

The purchase contract makes the buyer legally responsible for the loan. 

The second is a rehab property that I purchased for myself, I purchased it out right for 100k.

The rule of thumb for me used to be that the property needs to be able to do 20% of the purchase price in gross rental income.