It sounds like you've absorbed a bunch of problems already and a new sewer line and the current basement situation will cost you way less than the $50K in fees to sell it. 

What costs/fees should I look out for?

There are lenders that will do 0% origination, but fees and rates are like two levers that usually have an inverse relationship.

The PM had a plumber go to the house, incurring an after-hours emergency fee, but was unable to assess the exact cause of the issue at night, stating it's either a frozen pipe or pump issue and they need to return during the daytime to fully address.

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

Can easily get a 20% referral fee just for sourcing and handing off that lead.

Wondering if it will be a waste in fees paid to either HELOC or Cashout Refi because there may be a possibility of having to sell to get the primary residence we want next year and end up paying Realtor fees to sell it. 

We built two homes side by side on infill lots with a lot value of $20k each and hard construction costs of $196k (builder’s fee not included).

The management company replaced some of them, however there are still several other fees related to the theft that we are trying to get reimbursed for (they told us we would not be charged, they charged us anyways).

Home warranty programs charge a trip fee every time you file a claim, and they use that fee to compensate the vendor.