Hey @Luke Werkmeister-Martin!
It depends on what you are looking to do. Clearly, house B has a bunch of equity that you could use to go buy other properties. You could most likely pull out around $400,000+ from house B and the property will still have cash flow.
Then it just becomes what you want to do with that money. It looks like the two properties you have are an equity/appreciation property. You could go buy more of those, you could buy a bunch of cash-flow properties, or a multifamily property.
Or you could go into fix and flips, or BRRRR.
There is no right way to move forward in this space and it is about what you want out of it.
If you are looking for cash flow, you could invest that money into the Midwest in an area that you like. Depending on the market you could find a property that is rent-ready for around $100,000-$150,000. With an 80% loan to acquire it, you would bring around $28,000-$40,000 to the table, and buy 10 properties.
You could buy properties similar to what you have, but they are going to require you to put a lot more down if those rental numbers are accurate.
Fix and flips, with the amount you would be getting out you would not need to get a loan unless you wanted to. That would help maximize your profit, or you could get a loan and do multiple projects at a time. Sell or rent and refinance, then go on to your next projects.
Multifamily property, you could put all your money into one basket. Hopefully, the cash flow and potential appreciation are enough to keep you satisfied. Then in the future, sell or refinance and you can upgrade to a bigger/nicer multifamily property.