These are the costs you can write off in a 1031 exchange. See below, from Knowing Your 1031 Exchange Deductions:
1031 Exchange Expenses that are Tax Deductions
Any expenses that are directly related to the sales transaction are 1031 exchange tax deductions. This includes items such as:
- Real estate broker commission costs
- Accommodator fees
Escrow and title insurance fees and filing fees1
- Transfer taxes (if applicable in the property’s location)2
Note that although you may have completed the work in order to achieve a better sales price, or even during escrow as part of the sales process, maintenance work such as painting would not be deductible from your 1031 exchange. This work is deductible – but from your operating income.
I couldn't find anything definitive on travel expenses, but I would think not: although they're used to procure income-producing property, I don't think they're deductible as part of the cost.
Here's the full text of the article:
Start up costs should be set up to depreciate, not added to the basis of your property.