1031 Exchange
A 1031 Exchange, also known as a Like Kind Exchange, is a way of structuring a sale of certain kinds of property so that the seller's profit or gain is not currently taxed. Instead, the property that is sold is replaced with another "like kind" property. If the transaction is properly structured, the seller's profit or gain in deferred to a future date.

401(k)/403(b)
An employer-sponsored investment plan that allows individuals to set aside tax-deferred income for retirement or emergency purposes. 401(k) plans are provided by employers that are private corporations. 403(b) plans are provided by employers that are not for profit organizations.

401(k)/403(b) loan
Some administrators of 401(k)/403(b) plans allow for loans against the monies you have accumulated in these plans. Loans against 401K plans are an acceptable source of down payment for most types of loans.