I'd recommend getting 2-4 quotes from reputable GCs with extensive experience here in SD.

North Carolina is a Lanlord friendly state.North Carolina is worth the investment because of our high occupancy rates and a high demand for rental homes, the local real estate investors love the historically performance stability, specifically single family homes.North Carolina has very good reputable colleges and universities, that’s the reason a lot of people make their move to NC and want to just rent a house until they get acquainted with the area.Charlotte’s home prices compared to states up north are dramatically significant.

We expected that at some point, cast iron pipes of this age would simply need to be replaced or relined - but since there is also confirmed leakage, we would like to do this sooner rather than later.We would like to opt for the less-invasive CIPP re-lining.We have received quotes from 3 different plumbers, all for upwards of $35-45k to reline 70 feet with 16 reinstatements.

Is it finding local properties in disrepair, finding hard money lenders, or getting to know reputable contractors?

I am in need of reputable outfit that provides consolidated  Family  Office Services under one roof in Sacramento  area( Asset Protection, Trust and inheritance, Tax  services and strategies  and   Financial Advice for  Real Estate Investors ).

Finally, reputation is important.

After a plumber repaired the leak, he told me that the plumbing System did not have ventilation.

Does anyone have any recommendations on reputable companies and/or a reference?

You could contact them and they might be better able to represent you a a buyer's agent, or refer you to other good reputable agents in the area. 

However, it’s important to research crowdfunding platforms and investments carefully to ensure they are reputable and have a track record of success.Land Development StrategyInvesting in land development involves purchasing raw land and developing it into residential or commercial properties.