All you can do is charge the tenant whatever rent the market will bear. We don't have a VAT tax in the U.S., so there's no basis for you to add a tax component on top of the negotiated rental amount.
Strictly speaking, your tenant (because you are a non-resident alien and the rent is considered US-source) is supposed to withhold 30% of the rent and pay that to the Internal Revenue Service:
"Under Federal law, foreign taxpayers are taxed at a flat 30% on their U.S.-source "fixed or determinable, annual or periodic income" ("FDAP"). IRC Code Section 861(a)(1). This type of income usually consists of interest, dividends, rents, royalties and personal services. IRC Sec. 871(a)(1). It is usually income that is passive in nature and has a high gross-to-net ratio. In other words, FDAP income generally does not have business-type deductions associated with its production. The payment of this tax is enforced through a withholding procedure in which the person making the payment to the foreign person is obligated to withhold the tax and pay it directly to the U.S. government. IRC Code Section 1441. A foreign person is not entitled to apply for a refund on FDAP income."
http://www.google.com/search?hl=en&q=1441+871+fdap+rent
The logic for this system is that you are beyond the reach of the US tax enforcers, so it's unlikely you will pay the 30% tax that the US tax law imposes.
Informally speaking, I'd say that if your tenant pays you 100% then nobody will pay the tax.
