This really depends on the real estate investor, how much time they have, if they’re financially savvy, and if they can figure it out on their own without making mistakes that will cost you $$$ in the long run.Yes, expenses on the Duplex expenses need to be prorated between the side you occupy and the side you rent out.

Next we have actions to on-shore US manufacturing industry by eliminating foreign advantages in trade (this is where tariffs come into things) and forcing foreign business to invest in US domestic operations. 

How about reducing or eliminating quarterly payments?

There's NO way this was an innocent mistake, especially if he knew the other guy quoted $9,000, and you didn’t go for it.

@Terrance Coleman Welcome aboard...lets of great resources or others mistakes to learn from here!

I remember one guy in the S.F.Bay area that found a site for a new Pepsi plant when Pepsi was unable to find one and made a very large finders fee, his mistake he got involved in the deal to far instead of stopping at the introduction phase and the Pepsi lawyers used that to not pay his finders fee, but only waiting until it was almost time to pay him and the deal was basically done.

First, you are making a mistake keeping the tenant who violated your no-pet policy and hasn't paid their share of the rent ($50 a month).

With the mistakes that have already occurred, you are already costing yourself more than $500.00.Once the property is vacant and repaired, I would hire a local Property Manager to oversee it.

List all the mistakes you made, from screening to accepting late rents. 

They were clueless about what we're looking for in a contracting vendor.Don't make the same mistake:)