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Whether the corporation directly pays the expenses or a check is made to you and then you make another check for the expenses does not matter and does not change the result.
Since these are personal expenses when the corporation pays it will be recorded as an amount that you either owe back to the corporation or that has been withdrawn by you from the corporation. Again, either way can be used and this decision is often made at the end of the year so the best choice can be made.
What is vital is that these expenses are tracked and recorded properly so that it is not treated as a tax deduction of the corporation; but rather a payment to shareholder.
I hope is helps to know that you can use either method so long as you correctly record the transactions as having been paid for a shareholder and not a corporate expense.
Please ask if you need clarification.
From the facts you described the owner of the property is you, personally.
Since you own the property the expenses are yours and you will personally benefit by owning the structure.
Presumably you will be renting this structure to your company. In some cases a lessor can pay for improvements; but that is not the case you described.
The expenses to improve (unless otherwise contracted) are the owner's expenses; so in this case they are personal expenses.
I hope this helps to clarify for you.