Pushing into other, close-by, markets is the best (and maybe only) way to make it work.

Youve asked is there a resource for finding market rents?

Based on IRS Private Letter Rulings (PLR 200805012 and PLR 200901020), development rights can qualify as like-kind property for a 1031 exchange if they are considered interests in real estate under state law.

If I'm ever in need of a broker in the DE markets, I will reach out. 

We’ve worked together for about 2 years now, and he is focused on the operations side of the business.There are many solid sponsors and operators in this asset class, some newer than us, and some older – and quite a bit of new money coming into this space (part of this is where we are in the market cycle, and other asset classes being overpriced like apartment buildings).I’ve personally had several conversations with @Jefferson Lilly (and met him at a conference), and he knows the space well.

I'm starting a property management company and I'm curious to know how people have marketed themselves online.

Do you have experience and know the cycles of your market so you know the best price?

RE isn't the stock market. 

This allows you to access funds while keeping your existing mortgages intact.Second Mortgage: Explore lenders who offer second-position loans on investment properties, though rates will be higher.Cash-Out HELOC : While traditional banks often restrict HELOCs on non-owner-occupied properties, some portfolio or private lenders may offer HELOCs for investors.With $15-20K in liquid funds, look for deals where you can negotiate terms:Seller Financing: Negotiate lower down payments or interest-only periods.Subject-To Financing: Assume the seller’s existing mortgage while covering the down payment.Lease-to-Own: Lock in the purchase price while using rental income to build equity.

Those are all going to be good market.