Sonja Morgan is not taking no for an answer when it comes to selling her NYC townhouse ... because TMZ has learned she's just put it back on the market!

Real estate sources tell us the 'RHONY' star is listing her Upper East Side townhouse for $8.75 million. Sonja initially listed it way back in 2013 for $9.95 million amid her divorce from J.P. Morgan heir John A. Morgan.

The 4-bedroom home has seen a lot of changes since then because we're told Sonja has given it a complete makeover over the years.

She had an offer in 2017, but turned it down because her daughter needed stability at home amid the divorce -- she would frequently bring friends home from boarding school, so they still needed the space.

As we've reported, she listed the 5-story townhouse for the 7th time in 2017 for around $10 mil ... still, to no avail.

Someone's missing out ... all the bedrooms feature wood-burning fireplaces, and there's also an elevator, sauna, gym, and terrace -- all sitting in the ritzy Madison Ave and Central Park neighborhood.

In January 2020, Sonja had an $11.75 million cash offer, but the buyer ended up dropping out in February when the pandemic began. Then, for a period of time, she couldn't show the home because of COVID.

After the lockdown lifted in the city, she rented the home to a family from Spain, before renting it out to a new tenant, for 32k a month. We're told, the tenant recently moved out.

Now, Sonja is back at it ... determined to get the pad rented again, or sold for the asking price.

Thomas Wexler of Leslie J. Garfield & Co. holds the listing.

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