I marketed the unit and screened/accepted new tenants, accepted holding deposit in secured funds.

I am now in a contract position as 1099 and have the option to fund my own Solo 401k up to 55k, which is amazingly awesome compared to most employers just providing the individual limit. 

The remaining funding will come from us personally. 

If you invest that $100K in say a income fund you can earn 8, 10, 12% returns annually.

EldredBuild A Rental Property Empire by Mark FergusonThe ABC's of Real Estate Investing by Ken McElroy What Every Real Estate Investor Needs To Know About Cash Flow by Frank GallinelliFinding and Funding Great Deals by Anson YoungInvesting In Real Estate with No(and low) Money Down by Brandon TurnerThe Book On Managing Rental Properties by Brandon TurnerLong Distance Real Estate Investing by David GreeneTips & Traps for Negotiating Real Estate by Robert ErwinHow To Win In Commercial Real Estate Investing by R.

(for the record, the property is cash flow positive about $100 per month as is and is only a 5 year old home, but my emergency fund is only about $10k right now)And does it make sense to ever use a line of credit?

Why not use all your 1031 funds for the replacement...?

"In one private letter ruling (PLR 8429039), the IRS stated that a minimum holding period of two years would be sufficient.

I would recommend sending them an LOI which lists your intent with the property, your assumptions about the property, and if possible, proof of funds.

I suspect Zillow will try to imitate Opendoor since Opendoor just got a huge round of funding from a Hedge Fund.