Sergio is an actor by trade and a playboy by nature, while Joaquín is an unlucky-in-love estate agent, constantly battling to keep his job and sell the show flat on the ground floor.

As president, Javi is often inundated with petty complaints from the residents, who include his parents, Vicente Maroto and Gregoria Gutiérrez, who live below him in apartment 2B.

They share a floor with Amador Rivas, Maité Figueroa Espinosa and their three children (apartment 2A); and Germán Palomares, a defaulter whose identity is completely unknown.

In flat B reside Enrique Pastor, a civil servant, his wife Araceli, her mother Rosario (Charo), and his teenage son Francisco (Fran).

The two other spaces on the ground floor are occupied by a hairdresser's shop, owned by Araceli and staffed by Fabio Sabatani, a gay Argentine and friend of Silvio, and Sandra Espinosa, a young insecure hairdresser; and the estate agents' office where Joaquín works alongside Eric Cortés and their boss Raquel Villanueva.

Other recurring characters are Máximo Ángulo (Maxi), the community's doorman and husband (separated) of Izaskun, and Coque Calatrava, the ex-convict gardener.

Nines takes on work as a maid in various flats in the building, and in one episode is about to marry Leo before he leaves her at the altar after claiming he is in love with Raquel.

A structural change is that the old hairdresser's shop on the ground floor is converted into a bar, called Max & Henry's and run by Maxi and Enrique.

Amador's wife Maite takes the role of "First Lady" seriously, and becomes obsessed with her image, splashing out on luxury items in order to look good despite her own family's crippling financial troubles.

Estela is a former actress and her extremely dramatic, loud, crafty, and lustful nature causes plenty of stress both in Javi and Lola's home as well as in the rest of the building.

Coque, now moonlighting as the doorman after replacing Maxi, starts the series as something of a henchman for the power-mad Antonio before running away with the latter's wife Berta, who after feeling neglected by her husband has an affair with him.

Antonio is unaware of this affair as he is too busy in his role as President of the Community, obsessing over tracking down the defaulter Germán Palomares.

Amador, meanwhile, is left without a job after being replaced by a pot plant in his bank, and without money, love and a home as his marriage with Maite remains on the rocks.

The fourth season starts with a summary of the previous four months, in which Enrique was kidnapped by Germán Palomares, and Coque and Berta lived together in the countryside farming goats.

Estela continues to stir up trouble, and after a brief affair with Leo and others, is eventually kicked out of the house by her own daughter, Lola.

He is an illegal immigrant from South America who agrees to pay Amador, who mistook him for a woman when they met on the internet, 6000€ in exchange for his hand in marriage.

In the final episode of the season, Goya is found dead in the kitchen while cooking croquettes, Berta leaves to join a convent, and Antonio, Coque, and Enrique (going under the name "The A Team") set off on a caravan trip around Spain together.

Her new-found sexuality, mixed with her old feelings with Enrique (they are now still married, but separated), her battle for her son, her absent-mindedness, the homophobic views of some in the community, and her ongoing therapy sessions with Judith, make it difficult for them all to get along.

Sergio is another returner to the community; he comes back after having invested all his savings in shady deals and wants to fight for the paternity of his son with Maite, Amador Jr. (nicknamed "Chicken Eyes").

Enrique is in the dark about the existence of his son for a long time, but eventually finds out after randomly bumping into his pram in an Airport at Chicago.

This event eventually leads to him being deported back to Spain as a suspected terrorist, and he is soon followed there by Judith and their son, who are refused re-entry into the States due to Enrique's criminal record.

Meanwhile, there is another new baby in the community, as Lola gives birth to Javi's daughter, but they are unable to come up with a suitable name for a long time until they eventually choose Úrsula.

Lola suffers from great depression, loses her job in her television series, and has to keep on putting up with her parents, Estela and Fermín, who are back in love and marry.

Amador and Maite continue to have financial woes, losing the flat they were squatting in (2ºA) after it is reclaimed by Edurne, the daughter of recently deceased Izaskun.

In addition, Nines and Coque have an affair, Nines gets a job at Max & Henry's, Fermín and Estela get their own reality TV series, Antonio and Matthew (an over-sensitive American who is splitting up from Ingrid, Judith's sister) move into Enrique's flat to form the "Happy Singles", Rebeca has to deal with her socially inept gynaecologist ex-husband Santiago, and Vicente starts an affair with Penélope, only to find out she is a mass murderer.

Amador decides to return to civilization after six months in the forest, and will be helped by La Chusa (character who had left in a couple of episodes), a junkie from the slums.

Berta will insist on Antonio asking her for marriage, but this will have problems with Fina, a very problematic old woman who moves to 2 °C who will not stop making life impossible for her neighbors and who, mysteriously, knows everything that has happened in Montepinar.

Yoli will bring her mother, Menchu, noisy and like her daughter, causing several problems, such as: causing Teodoro and Alba to leave the 2°A and live with Antonio and Berta, not accept that Amador leaves her and try to have children with him, renting Enrique the Bajo B after the departure of Araceli and settling in Attic A with her mother at the end of the season.

For this, the neighbors will have to go to all kinds of places to make time: A hotel, a makeshift campsite, Villazarcillo (the village of the deceased Justi, the mother of Amador and Teodoro), the old house of Bruno...

During Coque's vacation period, Fermín hires Clara as her fellow, who is Menchu's niece and whom she recommends to minimize an important expense such as the janitor's salary.