As an alternative, would a cash-out refinance, a home equity loan, or a HELOC make sense for you?

I would not invest in real estate with a retirement account.Its too much of a headache and likely not that much better as an investment alternative within a retirement account1) Real Estate provides tax benefits for individuals who own them.

Defaults and Remedies A default exists under this note if (1) Borrower defaults in the payment of this note or in the performance of any obligation in any instrument securing or collateral to this note; (2) (a) Borrower or (b) any other person liable on any part of this note (an "Other Obligated Party") fails to timely pay or perform any obligation or covenant in any written agreement between Lender and Borrower or any Other Obligated Party other than as described in (1) above; (3) any representation in this note or in any other written agreement between Lender and Borrower or any Other Obligated Party is materially false when made; (4) a receiver is appointed for Borrower or an Other Obligated Party or any property on which a lien or security interest is created as security (the "Collateral Security") for any part of this note; (5) any Collateral Security is assigned for the benefit of creditors; (6) a bankruptcy or insolvency proceeding is commenced by Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party; (7) (a) a bankruptcy or insolvency proceeding is commenced against Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party and (b) the proceeding continues without dismissal for sixty days, the party against whom the proceeding is commenced admits the material allegations of the petition against it, or an order for relief is entered; (8) Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party is terminated, begins to wind up its affairs, or is authorized to terminate or wind up its affairs by its governing body or persons, or any event occurs or condition exists that permits the termination or winding up of the affairs of Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party; or (9) any Collateral Security is impaired by loss, theft, damage, levy and execution, issuance of an official writ or order of seizure, or destruction, unless it is promptly replaced with collateral security of like kind and quality or restored to its former condition.

Things have to go really bad from here, as I see it, for the office to underperform alternatives in the next few years, from a cash flow perspective. 

With that said, get materials ordered early - especially for kitchens and baths.

Alternative options include offering a significant down payment, a lease-option agreement, a joint venture, or a deferred closing to align with John's timeline.

We walked a house one time that had alternating piles of dog, cat and human feces all over the floors.

I've even heard of GCs using auction type settings for returned items at Home Depot and Lowes for steep discounts.I've learned a lot about the GC game as I was up close to over 40 projects last two years and some went well and some did not and when they did not it was all Contractor related.If a GC isn't sourcing cheap materials at the same time milking the hell out of his 150-200 per day workers, then you can find yourself eating into your margins real fast. 

Therefore, I have a hard time committing to a house hack which contributes greatly to my problem of raising capital for a conventional mortgage with a 20%+ down payment instead of alternatives such as an FHA. 

As everybody has noticed the increase in materials and labor has skyrocketed which has thrown a wrench into condominium reserve studies.