My husband and I “retired” early did the whole sell everything and full time RV.  

If you sold the property already and didn't engage a 1031 intermediary at the time of sale, it may be too late to do a 1031 exchange.It is unclear whether you did engage one as you meantion selling the propertying and 'wanting' to do a 1031 exchange.

I found a building with 4 units selling for 580k all units are currently rented totaling 4200$ per month. 

If that’s the case then the right thing would be to sell the properties.

You can get “blanket loans” but they’ll be higher interest and make it a little harder to sell.

I would not recommend this strategy.Deals:The markets have been stagnant for the last 9 months, prices have not risen and expensive properties with higher rents are having trouble selling, even if they are at the same market caprate.

Hi there, I have a seller wanting to sell a fourplex and duplex but is trying to delay it till 2025 because of the capital gains she would accrue.

Is there a "sell down the road" play that makes sense?

Here are some steps to get started:Market Research: Identify areas with strong growth potential, low vacancy rates, and high rental demand.Financial Analysis: Evaluate the cost of construction, potential returns, and your financing options.Legal Considerations: Understand the zoning laws, building codes, and permits required for new construction in your chosen area.Sustainability: Consider incorporating green building practices to increase the property's appeal and long-term value.The Bottom LineWarren Buffett's investment in new construction underscores a broader trend in seeking alternative avenues for growth and diversification.

Take note that most of these zones will not have much investment, but if you can identify the areas that are in the path of progress, I think there is a great opportunity for upside.