I do not believe in the utility of complex corporate structures (at least more complex than the parent LLC/Partnership that my wife and I jointly own which in turn owns multiple single-member LLCs (disregarded) as a risk mitigation practice AND allows for easy 1031 movement between entities as the end taxpayer is the same (the partnership.)  

However, if it is held in your name or if it's in a disregarded entity (e.g., a single-member LLC), then the profits are already being "paid" to you and are simply a part of your own tax bill (regardless of if it's flowing into a property-specific bank account). - Is the 30K true taxable profit, or is it actually cash flow? 

LLC's are "disregarded entities" if it's a single-member LLC, for tax purposes.

You don't find these spreads anymore, disregarding outliers of course. 

@Mike JonesIf the single member LLC is disregarded by the IRS and fall under the umbrella of the holding you technically don’t need an EIN for it as you will use the holding EIN.However you can obtain an EIN for it for banking purpose to open an account.When you apply for an EIN on the IRS website you are asked for an SSN of a natural person.

Also, you need to determine if you really need an EIN if all of your entities are disregarded for tax purposes.  

If it's an entity that provides a benefit for paying dividends over salary (such as an s-corp in some situations), your answer may be much different than if the entity makes no distinction between the two (a partnership or disregarded LLC, for example).

You will want to file an individual tax return if the property is held personally or in a Single-Member LLC (Disregarded for Federal tax purposes) and a Business tax return (under the entity's EIN) if the property is held in a Multi-Member LLC/General Partnership/S-Corp/etc.

Since you are in CA, a community property state, you and your wife can elect to have your LLC treated (for federal income tax purposes) as a disregarded entity (a sole proprietorship) which will avoid a separate income tax filing.  

@Jim Chung and @Ken Teng,As long as you are forming a single member LLC as a disregarded entity so it will not file it's own tax return then there is no issue with a 1031.