Anytime we have had a claim and that was covered by my insurance broker it was seamless.

Do the tenants have renter's insurance? 

I could sell one of my properties (condo) use, that money for flips in Atlanta within the next 1-2 years build up additional funds to acquire an apartment complex, and to grow my portfolio, but I want to hear from some experienced investors and what they would do if they were in a similar position.Current Picture/Portfolio: Property 1: Condo (Atlanta, GA 30328)Current Rent = $1550/MonthUtility Reimbursement = $200-300/MonthHOA $383 (In line with HOA's for other communities) Purchased June 05th, 2015 and resided in property until Jan 22nd, 2017 (Total of 1.64 Years)Lease Started Jan 23rd 2017 and Lease Ends on June 30th 2018.Current Equity 135,000 (Purchase Price)  - 85,000 = $50,000Current Comps Similar Properties are selling for $155,000 to $170,000Current Mortgage Terms: 15 yr Fixed 3.325% Monthly payment of $996 (Includes Insurance and Property Taxes)Anticipated Total Earnings if Sold at End of July $64,500 (Sell Price $155K) to $78,500 (Sell Price $170K)  Property 2:Town-home (Peachtree Corners, GA 30092)Current Rent = $2000-4000/Month (AirBnB) 60-70% Occupancy since November of 2017Purchased July 28th 2017 and currently residing in basement house-hacking with my younger brother.HOA $325/Month Covers, Water, Lawn Maintenance, Sewage, Security GateCurrent Equity 336,000 (Purchase Price) - 265,000 (Remaining Loan Balance) = $71,000Current Comps Similar Properties are selling for $345,000 to $360,000 due to private/public school ratings going up shortly after purchase.Current Mortgage Terms: 30 yr Fixed 4.326% Monthly payment of $1823 (Includes Insurance,PMI, and Property Taxes.)

The bank required I have both homeowner's insurance as well as Builders Risk Insurance. 

But you have to have a safe and habitable place, and get insurance to cover renters.

You would need to get insurance, generally enough to cover the note price at least. 

Taxes insurance P&I cost about $950/mo.

Home insurance: Realtor.com does provide this information, but I do not really understand the rationale behind the estimate.

If it's an older building, with aging systems, like @Owen Dashner pointed out, you'll have even more expenses maintaining everythingInsurance Estimate at $720/year: if you really can insure an 8-plex for $720/year, please PM me because I'd really want to know the carrier.

You have a good case as you are not the cause of the flooding or resultant mold.I don't know if you have or is required to carry renter's insurance.