Industrial Lot for Warehouse [Calc Review] Please Help!

[Dwad Lane]

I'm quite confused about the best way to analyze this, as it's based on a piece of land that we've already owned for around 10 years. Purchase price back then was about PHP20million. We're now about to build warehouses on the lot. The construction company has offered us 2 years "interest-free" to pay for constructing the 4 x warehouses, which includes parking, admin office, gates, walls etc. 

The quote for construction is PHP90,000,000 (Philippine Pesos). I can't change the currency, so it's in $ but meant to be Pesos. Anyhow, I'm quite confused as to how I can analyze this deal accurately because we've already purchased this lot a long time ago, and don't need to outlay any cash further. The construction costs are technically interest-free (factored into the quote), to be paid off monthly over 2 years. 

Any tips would be much appreciated. 

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*This link comes directly from our calculators, based on information input by the member who posted.