Welcome to the site @Alexander MartinezIf you sold it for a profit you could expect to pay capital gains taxes.

Knowing who negotiates in good faith and who is an a**hole,  knowing who can close and who wont (This extends to accepting offers with financing from certain lenders) all lends weight and credibility to the offer, or detracts from the offer.

We've come across a duplex that we're interested in purchasing (placed an offer on it of $137.5k), where the owner is a real estate investor at the tail end of their career and is planning on shedding their portfolio ...

If the clock is already ticking you may be forced into the "ok deal" category or just having to realize your taxable gains. 

@Tim Jonasson Wow I have always avoided land leases, but I didn't realize the holder had so much to gain at the expiration of the lease!

You could also just remove the carpet and pad and screw it down (you'll probably need weight to get the floor to settle tight as you screw).

Just ridiculous and based purely upon corporate gain in my opinion the liberals really have a way of secretively taking care of the the corporate agendas.

My strategy is to buy and hold, and hopefully gain enough passive income to replace earned income at some point.

Do I want to buy the house for more that $450,000 (if I'm given the choice) so that when I sell it and there's a gain I won't get nailed in taxes? 

If we decide to sell at the end of the 5 years we will most likely do a 1031 exchange into another property so we will not have to pay any capital gains tax.