Property tax guidance
I have a triple net lease in a strip mall. The landlord is dividing the property tax amongst the tenants. 

For example, the total property is 100 sq ft - my space is 10. Therefore I owe 10% of the tax.

My question is related to unoccupied spaces. The landlord is saying that property tax for that should be paid by the tenants

My 10 sq ft divided by 100 sq/ft less the unleased space. Thus significantly increasing my tax liability 

Is this the standard, appropriate way to dive out the cost?
[{"id": "ffo214n", "text": "Not sure which jurisdiction you\u2019re in but it would likely have to be spelled out as such in your lease for them to effectively \u201cgross up\u201d your taxes", "replies": [], "depth": 1}, {"id": "ffo2dhq", "text": "We are in prosper tx. \n\nNot seeing anything in the lease, will probably have to get my attorney involved", "replies": [{"id": "ffvprng", "text": "How could there be \"nothing\" in the lease about property taxes if you have a triple net lease?  I've reviewed probably thousands of retail leases.  Your lease should have a stated pro rata share percentage or state that you pay a prorata share for your 1,000 sf in the 100,000 SF shopping center.", "replies": [{"id": "ffwhr13", "text": "Sorry my reply was not clear. The lease has the calculation - it does not mention anything about the land lord grossing up the taxes. Basically my rented space divided by total rentable space", "replies": [{"id": "ffxwpng", "text": "I'd be glad to take a look at the lease if you want.  Looong time corp real estate manager, I love to straighten landlords out!  I guess I could DM you my email? I'm guessing you can't attach something to a Reddit message?", "replies": [], "depth": 4}], "depth": 3}], "depth": 2}], "depth": 1}, {"id": "ffoa1yi", "text": "You should pay a pro rata share of your space divided by the gla (gross leasable area) of the property.  LL should front the bill for vacant space.", "replies": [], "depth": 1}, {"id": "ffoc88e", "text": "lol.  of course he's trying to get you pay for it.  why should he pay!?\n\nyour landlord sounds like a smart ass.  and a cheap fuck.  \n\n\nyou shouldn't outlay taxes based on the fact that ll can't rent space.  that's funny shit.  you pay your proportionate share. simple.", "replies": [], "depth": 1}, {"id": "ffogl0p", "text": "Wont the LL be able to deduct the vacant space on his taxes or claim lost income on any vacancies? Why would a tenant pay tax on space that isnt theirs? Doesn't make sense to me no mater what state you're in.", "replies": [], "depth": 1}, {"id": "ffohh8z", "text": "Your lease \\*should\\* address this; hopefully, it states pro rata share and each tenant pays their portion based on the RSF they have leased. You should not be paying a heavier burden because of unleased space, that is the landlord's problem. \n\nI billed CAM including taxes and trued up for nearly a decade on commercial property, if you want to take a screen shot of the portion of the lease addressing tenant expenses and post it on Imgur, I can take a look at it.", "replies": [], "depth": 1}, {"id": "ffot53y", "text": "I would think any unleased property the landlord would have to pay the taxes on so like the other poster said he could write it off as a loss but you know that\u2019s logical thinking and who knows", "replies": [], "depth": 1}, {"id": "ffovdn6", "text": "Thanks everyone for the sanity check! I sent a detailed note to my landlord - he replied \u201coops - we made a calculation error\u201d\n\nMy foot", "replies": [{"id": "fg01jsb", "text": "Ya it sounded fishy on the landlords part. Are they doing the same thing for insurance or any other expenses?", "replies": [], "depth": 2}], "depth": 1}, {"id": "ffpif36", "text": "Read the formula in the lease.  Usually that calls for you to pay a prorated share, which means the LL pays for the vacant space. And if it\u2019s unclear, insist that is how it should be done...", "replies": [], "depth": 1}]