If you want to keep EOS tokens like office space for rent by awesome EOS dApp developers, you should hold onto 100% of your EOS tokens, and register them on https://eos.io/distribution (make sure you have the MetaMask Chrome plug-in installed to access your Ethereum wallet).

Sell your stake now for short-term gains or rent it out in a booming digital real estate market?

I think EOS will bring in a lot more rewards over time as a leasing mechanism than it would as a one-off sale.