Sourced through the MLS and negotiated heavily with the seller to get price reductions and credits at closing How did you finance this deal?

It is deferred until sold, via invisible basis reduction. 

I don't see an exact location in the OP, but if this is even remotely considered rural, you are adding another LTV reduction. 

The landlord should be named on the tenant's insurance policy for additional protection and to assist with tracking compliance.

If they can't agree to your reduction, walk away.

I am considering building up on my fourplex. 2 additional units.

If you sell a property, and do a 1031 exchange with the proceeds, but don't need all the proceeds for the down payment of the next property, are you taxed on the additional profit that isn't part of the exchange?

It will be extended, we'll see a reduction in regulations that hamper small businesses, and we'll see new regulations that help small businesses.

This results in a reduction of your FICA tax liability for the year.

Every market is different, but paying cash doesnt necessitate a huge reduction in price - it might, or it might just make the offer more competitive than other bids that require financing.